Blend Mode Bug Fixes

Fixed some of the weirdness with blend modes. Some of it ;)

Mayor Layer Update + Fixes

This mayor Layer Update adds:

• Blend Modes
• Layer Lock
• Opacity
• Duplicate/Merge

Also added the ability to open and edit .png and .jpg files.

Increase in code readability and stability.

• A bunch of minor improvements.

Thanks to Xenira for being a huuuge part of this update!

Layer system & improved backend

Stable release. Introduced a layer system, color picker, pixel coordinate display, better color blending, better grid solution and improved image serialisation.