Test for Mixin fixes

Updated to FG3 and made some changes to the build process. Hope this will address the mixin issues for 1.12.2.

3.6.2.2BETA

Release

3.6.2.1BETA

Merge branch '1.12.2' of https://github.com/OreCruncher/DynamicSurrou…

DynamicSurroundings-1.12.2-3.6.2.0

Merge branch 'master' into 1.12.2

1.11.2-3.4.9.8 Checkpoint

Checkpoint for potential RELEASE build.

1.10.2-3.4.9.8 Checkpoint

Checkpoint for potential RELEASE build.

1.12.2-3.4.8.5 Checkpoint

Capture source for 1.12.2-3.4.7.5

1.11.2-3.4.8.5 Checkpoint

Captured source for 1.11.2-3.4.8.5

1.10.2-3.4.8.5 Checkpoint

Captured source for 1.10.2-3.4.8.5