[Ohrrpgce] SVN: teeemcee/12724 Add valid_attack function

[subversion at HamsterRepublic.com]

teeemcee
2022-01-29 05:38:42 -0800 (Sat, 29 Jan 2022)
159
Add valid_attack function

"read attack name" and "outside battle cure" now throw serrBadOp instead of
serrBound errors, but we no longer care much about that.
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U   wip/scriptcommands.bas
U   wip/scriptcommands.bi