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Add syntax highlighting to forum code blocks

• Problem: code blocks on Greasyfork forum currently are displayed without any syntax highlighting with an obtrusive bright yellow background which looks very bad on anything bigger than a few words/lines.
• Solution: enable the same syntax highlighter that is used now on the userscript code page/tab (CodeRay apparently).
• Side note: someone may want to apply the bright yellow highlight using tag so it should be fixed to implement this (currently it doesn't work), something like mark { background: #ff9; }

P.S. In case it's not easy to implement in the foreseeable future, there's a temporary userscript solution (screenshot).

@JasonBarnabe, hopefully this helps: http://stackoverflow.com/questions/230270/php-syntax-highlighting

Also the client side highlighting we discussed some time ago should work here as the code is not that big :)