Plan for raising NPC-per-map limits

NPC definitions

1. Store NPC pictures in an array of memory buffers, rather than an allmodex screen page (done)
2. Optimize NPC picture array to behave as a cache, only storing each set once, and automatically adding new entries when alter NPC changes an NPC's picture (done)
3. Update the N lump. (done)
   • store record size in BINSIZE.BIN (done)
   • get rid of 1920 wasted bytes in each record (done)
4. Update all code that assumes that exactly 36 NPCs exist
   • take special care that accessing non-existent NPC IDs <= 35 from a plotscript fails gracefully (why was this a problem?) (Not sure, since accessing a non-existent NPC ID <= 35 does nothing anyway) (N/A)
5. Increase the NPC limit (done)
6. Increase the limit even more! (done)

NPC locations

...and while we are at it...

1. Convert custom to use NPCInst objects instead of an array (done)
2. Replace the L lump with a RELOAD lump. See L
3. Update all code that assumes that exactly 300 NPC instances exist, including RSAV saving/loading
4. Update code that saves/loads temporary map state (not needed)
5. raise NPC instance limit

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Note that just because you will be able to use lots of NPCs on a single map, don't go hog-wild, because too many extra NPCs will have a (microscopic) performance impact, both on display and collision-checking.