Added a UI theme option to the boot options menu.
Adding an entry in the user config file to store the UI Theme.  In addition, I cleaned up some code and some coding style.
Moved the user UI theme lua option into the video options table.
Fixing a minor error.  I didn't mean to remove this function call.
Reverting the default UI theme change.
Merge pull request #187 from authenticate/upstream

Added a UI theme option to the boot options menu.