- Adding "videos/" folder to GameStructure
- Making mockup use GameStructure to reference "images/" and "videos/" folders
Removing "binaries" folder from EditorGameAssets. Was not used at all.
Merge pull request #318 from jtorrente/video-folder

Video and binaries folders
Added drawing functionality.
Added UI drawing widgets.
Added brush color and radius functionality.
Added undo/redo functionality while drawing.
Performance optimizations while drawing.
Saving the drawn image now can be done in a separate thread without an OpenGL context.
Now drawn image is saved in a background thread.
Optimized drawing memory usage. Now only keeps the minimum pixmap rectangle necessary to perform undo/redo.
Fixed null pointer exception while releasing drawn resources.