Colt M4A1 Remake Adjustments

Replaces the Colt M4 Carbine in RE3 with a reworked and tuned variant.

Features
- Extends the barrel a few inches
Just hate stubby rifles unless there's a silencer on the muzzle end

- Permanently add aiming point
If I don't have a handle, at least we can start right now
Has an aiming point model. It's just a visual change, you still
A real aiming point needs to be acquired in the RPD to get the effect.

- Permanently added rear iron sight
Is it practical? Absolutely not.. but looks cool and hates having the rear end of the gun sticky.

- folded inventory
Just a small change; give some length to the front, take it from the back.

- Replaced double stack magazines with single stack magazines
Although an option, I decided to remove the double stack magazine. looks
Not as awesome as it could be, the reload animation doesn't change, frankly
That said, the existing animations now make sense again. Furthermore, the model
Now consistent between in-game and cutscenes.