gmod_game: Added ammo dropping (Z key)

Revision 790
Added ammo dropping (Z key)
Fixed prediction issue in shotgun reload, which could cause inaccurate ammo counts to be displayed.
Fixed 0-9 keys failing to switch directly to the weapon when fast weapon switching was on.
Changed Files:
[ul]
[li]trunk/changelog.txt [/li][li]trunk/gamemodes/terrortown/entities/entities/base_ammo_ttt/shared.lua [/li][li]trunk/gamemodes/terrortown/entities/entities/item_ammo_revolver_ttt/shared.lua [/li][li]trunk/gamemodes/terrortown/entities/weapons/weapon_zm_shotgun/shared.lua [/li][li]trunk/gamemodes/terrortown/gamemode/cl_keys.lua [/li][li]trunk/gamemodes/terrortown/gamemode/cl_lang.lua [/li][li]trunk/gamemodes/terrortown/gamemode/cl_wepswitch.lua [/li][li]trunk/gamemodes/terrortown/gamemode/weaponry.lua[/li][/ul]

Committed By Stefan van der Meer