- Added some optimizations on auto ammo upgrade on grenade launcher.

- Slightly optimized the auto ammo upgrade on grenade launcher after reloading.

- Added a new cfg file, "registered gun.txt". This cfg file can be used to manually add/ remove guns that you want to give explosive ammo. The formats are like this:
weapon_smg = 1
weapon_smg_mp5 = 1
weapon_smg_silenced = 1
weapon_pumpshotgun = 0
weapon_shotgun_chrome = 0
weapon_shotgun_spas = 1
weapon_autoshotgun = 0
weapon_rifle = 1
weapon_rifle_ak47 = 1

- Added a new feature,"Allow Only Registered Gun". When this feature is enabled, only guns registered on "registered gun.txt" get explosive ammo. If disabled, all primary guns get explosive ammo.