Fix use-after-frees around mobjs

Fixes a series of use-after-frees related to mobjs. Most notably, makes R_RemoveMobjInterpolator properly remove the last item of interpolated_mobjs, and fixes every place where target, tracer, hnext or hprev were modified without proper reference counting – including one in p_saveg.c.

A notable use-after-free that this fixes is one that happens when a player spectates. While I cannot test this myself, I have heard that spectating mid-race can cause desyncs – this has a good chance of fixing them.

mentioned in merge request !310 (merged)

added 1 commit

• 55362b51 - Fix reference counting on hnext and hprev in P_RelinkPointers

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changed title from Draft: Series of mobj-related memory bug fixes to Fix use-after-frees around mobjs

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merged

mentioned in commit b2eff44d

mentioned in merge request STJr/SRB2!1863 (merged)

mentioned in merge request STJr/SRB2!1866 (merged)