Add Opfor and Independent sides.

[Freddo3000]

In order to keep dependencies to a minimum, only the following addons should be loaded:

ace
acex
acre2
cba_a3
cup_units
cup_vehicles
cup_vehicles_ace_compat
cup_weapons
cup_weapons_ace_compat
arc_misc
tmf

[BorderKeeper]

• Added INDFOR and OPFOR
• Filled out all attributes
• Slimmed down the ORBAT
• Renamed to ARCMT.vr
• WSL is now on his own net with other weapon groups
• Weapon groups have their own 343's now
• Renamed P to PHT, R to RVN and F to FLC as per convention
• Fixed missing name on Mortar leader