Add "Militaires Sans Frontières" Faction

[Emythiel]

Adds a PMC "Militaires Sans Frontières" faction, based on the Metal Gear Solid PMC of the same name.

• [x] Set up unit configs
• [x] Add retextured uniforms (Tiger Black, Desert & Wood)
• [x] Add retextured Heavy Plate Carriers (Black, Desert & Wood)
• [x] Add retextured Plate Carriers (Black, Desert & Wood)
• [x] Add retextured vehicles
• [x] Add elite unit variants for Black, Desert and Wood camo types
• [x] Add editorPreview images
• [x] Add UI images for Uniforms and Vests
• [x] Update config.cpp requiredAddons in Main
• [x] Clean up configs a bit before release