Extended UI widgets to handle erasing functionality.
Added erasing functionality, also undo/redo correctly working.
Fixed small bug while traslating when resizing.
Fixed Windows path problem while saving the drawing.
Improved drawing algorithm.
Fixed a bug that would cause Templates to copy an existing image into the same folder.
Improved erasing process by caching some inputs before uploading to the GPU.
Improved saving drawn images algorithm, now the saved images have Y-UP coordinates.
Merge pull request #334 from RotaruDan/erasingFunctionality

Erasing functionality.