Increased drawing resolution for scaled screens

[tobiasnmf]

Scales canvas with screen scaling.

Comparison with 150% scaling: Before: After:

[vale075]

I manually installed this fork (not only this merge request but also other commits that have been made later in the fork) and it seems to have fixed the infinitely expanding canvas on windows (making the add-on actually usable) as well a other things. I believe it would be very useful and make the add-on usable on windows if this fork was merged.

Btw, thank you very much IceColors for the fixes, and krassowski for this add-on !