Switch weapons by numbers

The script allows you to switch weapons using the number keys on your keyboard.
Holds all slots.

Also includes:
- In the presence of brass knuckles, the ability to switch brass knuckles to a fist;
- Saving brass knuckles with a switched fist when saving the game;
- Restriction on weapons in gyms;
- Switching from explosive to detonator using RMB;
- When CJ is out of control, weapons cannot be switched.