Restructured the themes folders.

Core themes will now be installed in the root of '/public_html/themes'. All custom and provider (3rd party) themes will be installed in the respective folders located in '/public_html/myThemes'.

This way during an update all you need to do is remove everything but '/zones', '/public_html/myThemes' and '/public_html/index.php', upload the update and then run any database updates needed.

Also cleaned up the database class a bit.