Polyobj waypoint thinker optimise

An attempt at optimising the thinker for PolyObjects that follow waypoint. In particular, a pointer to the waypoint the PolyObject is currently going to is introduced, so the waypoint thinker doesn't have to go through the entire mobj thinker list every tic just to re-find the next waypoint every time.

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• 1d04001f - use P_SetTarget to assign a value to th->target

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Probably should also check for P_MobjWasRemoved to NULL target before the loop?

I could but tbh waypoints aren't likely to be removed mid-game by anything except via Lua scripts, so I'm not sure whether it's necessary to consider the possibility

I would recommend it personally but can't singlehandedly make you do it and am too tired to do it myself so whatever

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• 7c9b1ee2 - Fix P_SetTarget crash by setting th->target to NULL first

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merged

mentioned in commit b5df2d5c