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Fix use-after-frees around mobjs

X.organic requested to merge X.organic/Kart-Public:mobj-after-free into master

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.

Edited by X.organic

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