CSS highlighter locks up application

[quartexNOR]

The CSS highlighter, when used with a modern css file, just freezes the entire application.
I have tried to track down where in the code this might happen, but the freeze is so hard that the debugger doesnt even kick in.
I have a hunch that its a matter of new CSS keyword which the parser does not know. I am not intimately familiar with how the highlighter works, but i noticed that it uses a hash based lookup table, which might explain the issue when faced with an unknown keyword, or syntax for a known keyword that has changed in later times.

Right now, the css highlighter cannot be used, which is really sad because it was very useful.

[pyscripter]

Duplicate of #241

[quartexNOR]

Here is the fix.