Cleaned up HUB panels submenu.
 * Renamed Integral Menu and Core Selector to things which will actually make sense to players.
 * Flipped the sign of half the Tooltip options. Some were phrased as 'Show X' and the others were 'Hide X'.
 * Added Show Units and Show Wreckage options to Tooltip so it is now easy to disable the tooltip.
Merge branch 'master' of https://github.com/ZeroK-RTS/Zero-K