new TOP_ROOT variable and project simplification
Merge branch 'master' into 185-helvetica-accent

Conflicts:
	app/Joker/Joker.pro
	tests/GraphicStripSyncTest/GraphicStripSyncTest.pro
	tests/GraphicStripTest/GraphicStripTest.pro
	tests/GraphicTest/GraphicTest.pro
	tests/VideoStripTest/VideoStripTest.pro
	tests/VideoSyncTest/VideoSyncTest.pro
	tests/VideoTest/VideoTest.pro