[New Feature] Allow a unit to get multiple powerups

[Bittah]

First Check

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Description

Units can normally only pick up every powerup crate once and picking up another crate containing the same powerup causes it to give money instead of that powerup. Powerup crates should be allowed to stack.

Proposed Code (optional)

No response

Additional Context

ts-patches implementation: https://github.com/CnCNet/ts-patches/blob/master/src/crate_patches.asm