Added prototype for ACP style editor

Currently only the form to create a style exists, more features will be added soon :)
Fixed #1
Fixed double borders in style editor
Added StyleEditForm and implemented preview image uploads
Added style list page and fixed a few issues
Added button to duplicate a style ("copy")
Added form to export styles
Added enable/disable button for styles
Fixed template scripting error
Added ability to export styles as packages
Moved permission to use disabled style into WCF
Adds ACP page titles
Merge pull request #2 from Gravatronics/enhancement/acpPageTitle

Adds ACP page titles
Added some more variables to style editor
Fixed support for LESS overrides
Fixed handling LESS overrides
Removed predefined variable (not covered by editor)
Fixed activeTabMenuItem
Fixed import order
Fixed handling of empty lines and hashes