Restore QML/C++ extensions tutorial and fix plugin docs and examples

This restores the "Writing QML Extensions with C++" tutorial that
was removed during the recent QML doc restructure.

This also updates outdated docs in "Creating C++ Plugins for QML"
that referred to the use of Q_EXPORT_PLUGIN2() and such as the
process for writing QML plugins in Qt 5 has changed.

Note the plugins.json line was removed from
examples/qml/cppextensions/plugins/plugins.pro since this json file
was removed in a previous commit, as plugins no longer require the
empty json file.

Change-Id: I795d6faf6a741466a952feb8e15b028ec3d52b69
Reviewed-by: Chris Adams <christopher.adams@nokia.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/qml/doc/src/cppintegration/definetypes.qdoc b/src/qml/doc/src/cppintegration/definetypes.qdoc
index 969261a972..3ecd1de442 100644
--- a/src/qml/doc/src/cppintegration/definetypes.qdoc
+++ b/src/qml/doc/src/cppintegration/definetypes.qdoc
@@ -43,6 +43,9 @@ from QML.
 Additionally, the QtQml module provides mechanisms for implementing QML-specific
 features such as \e{attached properties} and \e{default properties} in C++.
 
+(Note that a number of the important concepts covered in this document are
+demonstrated in the \l{Writing QML Extensions with C++} tutorial.)
+
 
 \section1 Registering C++ types with the QML type system
 
@@ -633,7 +636,10 @@ QtQuick C++ module. Therefore, this class should be subclassed when it is
 necessary to implement a visual type in C++ that can be integrated into a
 QML-based user interface.
 
-See the QQuickItem documentation for more information.
+See the QQuickItem documentation for more information. Additionally, the
+\l{Writing QML Extensions with C++} tutorial demonstrates how a QQuickItem-based
+visual item can be implemented in C++ and integrated into a QtQuick-based user
+interface.
 
 
 \section1 Receiving Notifications for Object Initialization