Hotfix 1

Fixes Limestone worldgen crash
Fixes Deep Tank mastering Scorched Duct
Update WorldGenLimestone.java

adapt base on the hotfix branch
Merge remote-tracking branch 'origin/develop' into hotfix

Conflicts:
	src/tsteelworks/worldgen/WorldGenLimestone.java
Merge branch 'hotfix' into develop
Merge pull request #15 from Toops/develop

sync develop branch with Toops@develop