v0.13.6

This is a bug fix release, fixing the bug of the undo buffer not getting updated in the right place.

Full Changelog: v0.13.5...v0.13.6

v0.13.5

Unfortunately, I can't compile for Windows because trying to make raylib resulted in 1000+ errors, so there will only be a Linux release for now.

Anyway, in this release, I added the Undo feature, fixed a bug where the macro was not read correctly from the save file, and then there's everything that I added to KOPS before v0.13.5.