v2.0.0-rc.3

This is another pre-release version of 2.0.0 that fixes a few more issues before the full release.

I think this'll be the last release candidate before the full release, I just need the time to clean a couple things up before the official release and university has kicked into full swing again.

The only differences between this version and the previous release candidate are:

• Fix achievement arrays causing a crash (#25)
• Fix another brush normals issue (Thanks Thesentrygamer!)

Let me know if you find any other issues!