GPTGTA v5 Chopper/UZI/Punch

- Chopper button appears only while inside chopper.
- HIGH mode flies over everything, cannot land/exit.
- LOW mode can land on H pads only, but can crash/explode into cars/buildings.
- H pad teleport removed.
- UZI pickup added.
- Without UZI, action button = PUNCH.
- Punch knocks pedestrians down; they recover later.
- Repeated punch can leave pedestrian out cold.
- Basic gangmembers can punch/shoot the player.
