_[REQ] rev976 [ButtonBars] Add buttons tooltips

[ianiow]

On the battle maps there are no tooltips displayed when you pass over the symbols on the ui hud. I haven't a clue what half of the symbols do. (Two of them seem to make the cursor disappear which makes the game unplayable!).

[TheGrayMouser]

On the battle maps there are no tooltips displayed when you pass over the symbols on the ui hud. I haven't a clue what half of the symbols do. (Two of them seem to make the cursor disappear which makes the game unplayable!).

At least you didn't hit the one that makes the HUD go away completely! (cant find any hotkey that gets it back....)

control Q helps you get back to the main menu

[cothyso]

The [NFO] Controls thread and/or build's readme provide a list of useful keyboard shortcuts:

- TAB -> toggles GUI on/off
- LCTRL + O -> toggles mouse cursor on/off

[cothyso]

Added in rev977.

Added button bars tooltip messages in the gameplay status bar, and in the debug console.