change sidebardashboardbox system

now allows you to access the objecte with an eventListener
removing spaces
Improved iterator for nested categories
Improved error handling
Merge branch 'master' of github.com:WoltLab/WCF
Improved http_build_query (fixes reCAPTCHA)

As of PHP 5.3, the default seperator of http_build_query is
arg_separator.input, which is in some cases "&amp". This may cause some
unexpected problems i.e. reCAPTCHA doesn't work as intended.
Merge pull request #1398 from SoftCreatR/HTTPRequestFix

Improve http_build_query (fixes reCAPTCHA)
Fixed import issues
Merge branch 'master' of github.com:WoltLab/WCF
Fixed check for safe mode
Small optimization
Fixed unpack() to support PHP 5.5
Merge branch 'master' of github.com:WoltLab/WCF
Fixed support for quotable objects without a parent
Fixed spelling unifyDirSeperator -> unifyDirSeparator
Added attachment import
Merge branch 'master' of github.com:WoltLab/WCF
Fixes issue with CodeMirror and Firefox
Fix for misleading environment variable on IIS 7.0
Fixed import issues