Custom skincolor bugfixes

Merged James Hale requested to merge Machturne/SRB2:next-lc-uint16 into next
  • The variable signcolor was incorrectly used in place of facecolor, causing the signpost face's inverse shade to be disregarded.
  • SOC colors with spaces in their names were misread. Only the characters before the first space were read.
Edited by James Hale

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