Move @user parsing to com.woltlab.wcf.user

cf. WoltLab/com.woltlab.wcf.user@67a19668d20750015b0dc4a6322b5d17e59c8b69
Major icon overhaul
Fixed quote box
Smiley overhaul
Moved smilies to right location
Code BBCode improvements
Fixed nested quotes
CssHighlighter matches numbers with decimal part as well
Reduce amount of code in HtmlHighlighter by about 104%
Fixed BBCode administrations
Fixed list styling
Merge branch 'master' of github.com:WoltLab/com.woltlab.wcf.bbcode
Renamed 'inlinecode' BBCode
Made usage of 'parser_nonessential'
Add TeX highlighter
Clean up highlighter
Add BrainfuckHighlighter
Merge branch 'master' of github.com:WoltLab/com.woltlab.wcf.bbcode
Add brainfuck title
Replace regex with simple replace