Cleanup: Remove ShaderEffectSourceNode

We can simply use a standard image node and do the dirty marking also
directly in the texture (both live in the same thread).

Change-Id: I7345c702613782adec3c6a36a7705a2a54ed82ec
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
Avoid creating fbo with zero size in QQuickWidget

Get rid of incomplete attachment warnings on Android.

Change-Id: I7da546861b1814677b0c8ae110416f69bbbb7edc
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Introspect qrc files in FolderListModel.

And don't use "file watchers" for resource file paths,
otherwise it generates the following warning:

QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No
such file or directory

Change-Id: I6b75c9195fb2b2ba7b3e0bb7d146fc5cd343927e
Task-number: QTBUG-40307
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>