Currently only the environment and cinema tab in Atlas have scrollbars, however on min res, the bottommost elements on the map and player tab are not visible. Also adding more object to these (and other) tabs is useless since they won't be visible. Thus adding scrollbars to all atlas tab.
Notice that besides the needed vertical scrolling, there is horizontal scrolling too, thus some buttons are now only visible when scrolling (e.g. random seed button). For this reason i reduced the grid width for the sim buttons, so the display is slightly nicer. this can also be done for the other buttons.
