Add falling rocks to cave practice circuit 1#446

Merged

nkoenig merged 4 commits intoosrf:cave_feature_release2from azeey:cave_practice_circuit_1_rocks

Jun 9, 2020

+134

Commits on Jun 3, 2020

Commits on Jun 4, 2020

Change small rock fall to medium, update positions of large rock falls
azeey
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