All caves from beginning

[cech12]

Add a mod which enables to dig all caves from beginning of the game.

data scripts misc techtreetunes (almost at end) set tttexp_digbrush2 ,3 ,4

[microglossum]

Another idea: Larger caves! e.g. a cave which fits all 4 largest freetime buildings.

[cech12]

That could be difficult because of the pillar models. ^^