Revert "Moved path finder in model data (everything which is shared and not a module is data). Method setPos() of region manager should also update old position."

This reverts commit 934b773eb527be319698b840fe95f7ebd2489fa6.

Conflicts:
	src-plugins/vanilla-model/main/impl/RegionManagerImpl.cpp

Reason: The changes weren't really logically. It's probably better to change the documentation of ModelFactory and add getters for distance algorithm... so that other modules can access them if necessary.