Fix highlighting for character literals

[swandir]

Character literal with quotation mark inside breaks the highlighting. Changing escape string to \'|\\ fixes it. (escape string for double-quoted strings is \"|\\)

Before:

After:

Not sure why \\ is necessary to process " correctly though. I also tried escape='\' as it's done in C++ syntax mode but it gives incurrect result.

[aBothe]

Wow that's awesome! Thank you for fixing this ugly legacy bug!

[aBothe]

I hope there won't be escaping regressions.. but even if, there will be an other bug fix release :)