Defines starting with `i' in 321/game

• id386 321/game/q_shared.h:43
• idaxp 321/game/q_shared.h:49
• IT_AMMO 321/game/g_local.h:215
• IT_ARMOR 321/game/g_local.h:216
• ITEM_NO_TOUCH 321/game/g_local.h:558
• ITEM_TARGETS_USED 321/game/g_local.h:563
• ITEM_TRIGGER_SPAWN 321/game/g_local.h:557
• IT_KEY 321/game/g_local.h:218
• IT_POWERUP 321/game/g_local.h:219
• IT_STAY_COOP 321/game/g_local.h:217
• IT_WEAPON 321/game/g_local.h:214