Changed ColourTo to assert if asked to style backwards. In release builds this is ignored instead.
Changed ColourTo to assert if asked to style backwards.
In release builds this is ignored instead.

rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror