Support octave vs matlab '!' handling
Support octave vs matlab '!' handling

* lexers/LexMatlab.cxx
  (ColouriseMatlabOctaveDocument): Add ismatlab boolean to function, and on getting the '!', check if matlab to set as a command vs operator.
  (ColouriseMatlabDoc): use true for call to ColouriseMatlabOctaveDocument.
  (ColouriseOctaveDoc): use false for call to ColouriseMatlabOctaveDocument.

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