Fixed ZipWriter getDosDatetime on NaN value
Add Codemirror editor

see http://beta.woltlab.com/index.php/Thread/558-ACE-Editor-im-ACP-einbinden/
Merge branch 'master' into codemirror

Conflicts:
	wcfsetup/install/files/acp/templates/styleAdd.tpl
Fixed trailing whitespace
Removes debug code
Fixes use order
Fixed PIP file name
Fixed directory name
Fixes editing of non-native BBCodes
Cast to String in WCF.String.*
Updating minified JavaScript files
Hides smiley tab if user has no permission to use smileys
Merge branch 'master' of github.com:WoltLab/WCF
Fixes "enableOptions" for user group options
Made icons unselectable
Merge branch 'master' of github.com:WoltLab/WCF
Fixes multilingual offline message
Add codemirror LICENSE and README
Remove modes that are unlikely to be used
Remove keymaps and html files from codemirror