Support ! prefix for liquids wherever * prefix is supported
#469
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Related to #437; required for liquids in GoldSrc to "warp" (where it's used instead of
*).This doesn't do any additional game checking, but I don't think that's a big deal, since ! is unlikely to be used for standard textures anyway.
!support was actually added to Quakespasm about a year ago (in sezero/quakespasm#117 ). If the change in contents proves an issue, an arg could be added to QBSP to disable treating!as liquids.