improve / fix help module, fix #258 and #244

[commy2]

• fixes Missing keybind in menu and script error on mission start #258 (hopefully) and Conflict between CBA_Events and CBA_Help prevents mission from loading #244
• fixes: mods in main menu now auto cycle even when -world="empty"
• fixes: addKeyinding keys don't overwrite the help diary entry of all config based key handlers anymore
• uses new scripting commands (private keyword, configClasses, params etc.)
• uses faster createNamespace instead of hashes
• removes header files that are in Arma already and includes them instead
• removes CBA_help_fnc_describe, because it's never used, not documented and does no longer work sufficiently in A3
• adds function headers, uses macros where appropriate, etc.

[Killswitch00]

Is this needed?