Add Capsule slots to weapon bar, and add "Use Capsule" keybind

[starlinvf]

TL;DR

Add Capsule slots to weapon bar, and add "Use Capsule" keybind
Optional: Allow other thrown type items, such as grenades, mines and dynamite

What ?

Create a new set of "capsule slots" in the weapon bar, binding on each to a corresponding weapon group. When utilizing the "Use Capsule" key, the capsule in the current weapon group will activate on the current cursor location (subject to normal range restrictions).

Why ?

To make the capsules less clunky to use in normal circumstances, and support easier pairing with weapons to compliment each other.

Other concerns: UI Feature can be extended to Vehicles. However, number of slots and ammo storage are balance considerations.