Add dual wielding or able to hold multiple weapons.

I have been caught out multiple times trying to pickup my sidearm while still holding my primary or support, my brain don't work that quickly and most things allow this to be automatically balanced from the moment it is implemented;

• RPGs and Talons can't be fired when being held by one hand
• All primary weapons have their recoil increased when single-hand wielding
• No class has a support weapon except for assault and engineer

Only thing to be changed is that the assault grenade launcher may need to be nerfed so it requires 2 hands to fire, but it may already be a thing and I haven't noticed