simplify hotkey.c

[Thomas Bernard]

I think we should merge the two big arrays in hotkey.c ConfigKey and Ordering

I see no reason we coudn't add a word Ordering field to T_Key_config.

Also there is possible confusion between ConfigKey and Config_Key :

hotkeys.h:extern T_Key_config ConfigKey[NB_SHORTCUTS];
global.h:GFX2_GLOBAL word Config_Key[NB_SPECIAL_SHORTCUTS][2];