Move QML types registration to import modules

This change moves the QML type registration from platform input
context plugin to respective QML plugins:

    QtQuick.VirtualKeyboard (import.pro)
    QtQuick.VirtualKeyboard.Settings (settings.pro)

Input method types (e.g. from the virtual keyboard plugins) are still
registered in the qtvirtualkeyboard module, but with new URI:

    QtQuick.VirtualKeyboard.Plugins (plugin.pro)

This change is necessary, because the Quick.VirtualKeyboard URI is now
reserved for the QML module.

Like before, the Quick.VirtualKeyboard module cannot be used without
setting QT_IM_MODULE=qtvirtualkeyboard environment variable.

The main motivation for this change was to make plugins.qmltypes
generation possible for C++ based QML types.

Change-Id: Ieb449eb73e0fa33e9a1686d471cc4284982ea1bd
Reviewed-by: Jarkko Koivikko <jarkko.koivikko@code-q.fi>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

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