Fixed non working draw to Yuv420Semiplanar canvas
Minor changes
Added dynamic lookup of default window identifier
Changed back texture coordinates to OpenGL coord system
Fixed translation error in shader and inverted y coordinate in projection matrix
Changed file structure
Added space after if/for/while
Merge pull request #2 from EmilWestergren/master

Fixed dynamic default window lookup for X11 windows, fixed translation in shader, changed file tree structure