[Ohrrpgce] SVN: teeemcee/12004 Clarify that "change NPC ID" can change pool, add missing pool arg to ca

[subversion at HamsterRepublic.com]

teeemcee
2020-08-29 21:49:27 -0700 (Sat, 29 Aug 2020)
206
Clarify that "change NPC ID" can change pool, add missing pool arg to canon.

Also document how passing an ID as reference behaves.

And show an error if the new NPC ID is invalid instead of silent failure.
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U   wip/docs/plotdict.xml
U   wip/scriptcommands.bas