Added Custom Backpacks with PROPER slot counts

Backpacks:
DZ_Patrol_Pack_A3 = 27 slots (two secondaries, bandage)
DZ_Czech_Vest_Pouch_A3 = 30 slots (primary)
DZ_Assault_Pack_A3 = 40 slots (primary and secondary)
DZ_ALICE_Pack_A3 = 57 slots (primary, secondary, item)
DZ_TK_Assault_Pack_A3 = 57 slots
DZ_CivilBackpack_A3 = 70 slots (two primaries + secondary / or 10 items)
DZ_British_ACU_A3 = 97 slots (three primaries + item )
DZ_Backpack_A3 = 160 slots (SMG + SMG mag )

Slots:
SMG = 130
Primary = 30
Secondary = 10
SMG mag = 40
Primary mag + Items = 7
Secondary mag = 3.01