Add OpenGL core profile support to QtMultimediaQuickTools

When requesting a OGL Core profile via QSurfaceFormat::setDefaultFormat (e.g. to use Qt3D advanced features),
it is no longer possible to render QML Video items. This is because the requested shaders should be _core versions.
This patch adds the core shaders so QtMultimedia stops whining, and bind textures with the proper
format, since GL_LUMINANCE and GL_LUMINANCE_ALPHA are no longer valid in OGL 4.

Task-number: QTBUG-51064
Change-Id: I909e01e7dc7be07549e9ecf0a6425b309af38ea1
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>
Reviewed-by: Christian Stromme <christian.stromme@qt.io>