DigiPaint 6.5.0

Well met all! I've changed the undo/redo to undo or redo about every 1 second when you hold down the undo or redo button. Also added in debugging text for it, and I managed to find a bug in the undo/redo system. That is now fixed.

Moreover, I changed the base window size to be 1920x1080. I felt it starting in a low window size had some people unaware that resizing it to 1920x1080 is obligatory if you want the surfaces/layers to work and the DPI of everything in the software not be low res.