Add Deploy Countermeasures keybind

[mharis001]

When merged this pull request will:

• Add "Deploy Countermeasures" keybind, Close Feature Request: Throw countermeasures from vehicles keybind (units throw smoke) #116
  • Makes all currently selected vehicles deploy smokes/flares
• Prevent activating other keybinds while searching

[CreepPork]

What about vehicles that have multiple types of countermeasures? E.g. RHS USAF's littlebird with the ECM?

Edit: it works with the littlebird but as far as i can see, no way of selecting which countermeasure is deployed.

[CreepPork]

Would be very nice if this would be also applied to units.

[mharis001]

I think this better kept to just vehicles. Think the grenades actions will be better for units or a separate keybind for units to throw smokes be added later.