Made huge changes, (almost) final version

Updated the Options panels, and fixed the messed up colors, flattened various parts of the theme, amongst which, Add column function, and fixed entirely the User option panel single tweet and tweaked the dropdown menus.
Had to give up on the compose tweetbox padding 'cause it's a general setting and will alter others objects.
There are a few issues I've found out but I don't know how to fix these yet.