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Let SimpleObject also avoid other SimpleObjects within the same SimpleGroup…

Description

Let SimpleObject also avoid other SimpleObjects within the same SimpleGroup following rP9096, refs #6.

Fixes unreachable small stone mines inside large stone mines.
Fixes #4338.

Differential Revision: https://code.wildfiregames.com/D189
Credit rapidelectron for working out the two main issues (refs rP20396) and providing a similar patch.