Modularize virtual keyboard and add an extension interface

With the extension interface it is possible to add new input
method and/or languages without recompiling the Qt Virtual
Keyboard plugin itself.

The existing input methods are now isolated into plugins.
So installing a new input method is a matter of copying the
corresponding extension plugin to the plugins/virtualkeyboard
directory (and any collateral required by the extension plugin
itself).

This change also renames the HunspellInputMethod to
DefaultInputMethod. This change is necessary because some other
extension plugin may want to provide the default input method
instead.

Implementation plan
===================
[x] Create virtualkeyboard-private module
[x] Create plugin library
[x] Define interface for input method plugin
[x] Define interface for keyboard layouts
[x] Move existing input methods and layouts to plugins
    [x] HangulInputMethod
    [x] HunspellInputMethod
        [x] Maybe create a private library for sharing
            between HunspellInputMethod and LipiInputMethod
    [x] LipiInputMethod
    [x] OpenWnnInputMethod
    [x] PinyinInputMethod
    [x] T9WriteInputMethod
    [x] TCInputMethod
[o] Rename some C++ classes (too generic name?)
[x] Think again replacing the QtVirtualKeyboard namespace
[x] Update documentation
    [x] General instructions for creating a plugin
    [x] For the C++ interfaces too (previously removed)

[ChangeLog][Important Behavior Changes] Introduce an extension
interface for the virtual keyboard. All the current input methods and
some special keyboard layouts (e.g. Hunspell, OpenWnn, etc.) have been
moved to extensions. The extension interface allows third party to
create a new input method without having to modify or rebuild the
virtual keyboard. In addition, this change makes it possible to add
features and languages independently by copying the desired extension
to the system.

[ChangeLog][Important Behavior Changes] Introduce a virtualkeyboard
module, which can be linked against an extension plugin. This module
provides the C++ API necessary for creating an input method.

[ChangeLog][Important Behavior Changes] Wrap the entire virtual
keyboard API into Qt namespace (e.g. QT_BEGIN_NAMESPACE/QT_END_NAMESPACE).

Task-number: QTBUG-57602
Change-Id: I449f4429109f596a7a1df7517c81f97d4aada27c
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 0 insertions, 110 deletions

diff --git a/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/pointfloat/PointFloat.h b/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/pointfloat/PointFloat.h
deleted file mode 100644
index 91ee5e6b..00000000
--- a/src/virtualkeyboard/3rdparty/lipi-toolkit/src/reco/shaperec/featureextractor/pointfloat/PointFloat.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/*****************************************************************************************
-* Copyright (c) 2006 Hewlett-Packard Development Company, L.P.
-* Permission is hereby granted, free of charge, to any person obtaining a copy of 
-* this software and associated documentation files (the "Software"), to deal in 
-* the Software without restriction, including without limitation the rights to use, 
-* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the 
-* Software, and to permit persons to whom the Software is furnished to do so, 
-* subject to the following conditions:
-*
-* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
-* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
-* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
-* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
-* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
-* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
-*****************************************************************************************/
-
-/************************************************************************
- * SVN MACROS
- *
- * $LastChangedDate: 2008-07-18 15:00:39 +0530 (Fri, 18 Jul 2008) $
- * $Revision: 561 $
- * $Author: sharmnid $
- *
- ************************************************************************/
-/************************************************************************
-* FILE DESCR: Definitions for PointFloat dll exporting functions.
-*
-* CONTENTS:   
-*
-* AUTHOR:     Vijayakumara M.
-*
-* DATE:       28-July-2005
-* CHANGE HISTORY:
-* Author		Date			Description
-************************************************************************/
-#ifndef __POINTFLOAT_H__
-#define __POINTFLOAT_H__
-
-// The following ifdef block is the standard way of creating macros which make exporting 
-// from a DLL simpler. All files within this DLL are compiled with the POINTFLOAT_EXPORTS
-// symbol defined on the command line. this symbol should not be defined on any project
-// that uses this DLL. This way any other project whose source files include this file see 
-// POINTFLOAT_API functions as being imported from a DLL, wheras this DLL sees symbols
-// defined with this macro as being exported.
-#ifdef _WIN32
-#ifdef POINTFLOAT_EXPORTS
-#define POINTFLOAT_API __declspec(dllexport)
-#else
-#define POINTFLOAT_API __declspec(dllimport)
-#endif  //ifdef POINTFLOAT_EXPORTS
-#else
-#define POINTFLOAT_API
-#endif	//#ifdef _WIN32
-
-
-#include "LTKTypes.h"
-#include "LTKLoggerUtil.h"
-
-class LTKShapeFeatureExtractor;
-class LTKShapeFeature;
-
-/** @defgroup PointFloatShapeFeatureExtractor
-*@brief The PointFloatShapeFeatureExtractor
-*/
-
-/**
-* @ingroup PointFloatShapeFeatureExtractor
-* @file PointFloat.cpp
-* <p>
-* The functions exported by the DLL
-*   - ::createShapeFeatureExtractor
-*   - ::deleteShapeFeatureExtractor
-*   - ::getCurrentVersion
-*   - ::deleteShapeFeaturePtr
-*/
-
-/**
-*  @brief Returns a pointer to the instance of PointFloatShapeFeatureExtractor
-*
-* <p>
-* This function is based on run-time polymorphism. It creates an instance of 
-* PointFloatShapeFeatureExtractor at run-time and returns it as a pointer to the base class <i>LTKShapeFeatureExtractor</i>
-* </p>
-*
-* @param  none
-*
-* @return  Pointer to LTKShapeFeatureExtractor
-*/
-extern "C" POINTFLOAT_API int createShapeFeatureExtractor(
-                                    const LTKControlInfo& controlInfo,
-                                    LTKShapeFeatureExtractor** outFeatureExtractor);
-
-/**
-* @brief Deletes the feature extractor instance.
-*
-* <p> 
-* This function cleans up all the memory allocations done by the feature extractor by calling it's destructor.
-* </p>
-*
-* @param  featureExtractorPtr - Pointer to LTKShapeFeatureExtractor.
-*
-* @return  0 on Success
-*/
-extern "C" POINTFLOAT_API int deleteShapeFeatureExtractor(LTKShapeFeatureExtractor *featureExtractorPtr);
-
-#endif //#ifndef __POINTFLOAT_H__
-