Merge: from useplayertasks_removegroupocludee_nre - Bugfix for NREs and errors when using -enable-new-server-occlusion-groups - Unit tests to cover parts of old logic and entirety of new logic behavior. 20 tests totaling 255 permutations. Tests: unit tests + 2p on craggy with noclip, teleportation, disconnect, killing sleepers and using OcclusionValidateGroups