Main menu hotkeys

[elexis]

It would be nice to control the mainmenu from keyboard (instead of being forced to move the mouse). For example:

M - open multiplayer menu
 L - open lobby
 H - host game
 J - join game

M might be used both for Singleplayer -> Matches and Multiplayer. It should just check for the currently opened submenu. The current submenu can already be closed using escape Maybe we could also have a hotkey like ctrl+escape to close the gamesetup/lobby? See also:

Hotkey for clearing the lobby chat was discussed in #3396. For building hotkeys #1492, it was suggested at some point to allow the user to set hotkeys in the GUI. May or may not be needed here. Having them in defaults.cfg would be a good start.

[leper]

Certainly not simple since this whole thing does not seem useful, the whole hotkey choices need some discussion and I'm inclined to just close this as invalid.