Weather Selector (Disabled)

Weather selector: new set of conditions (reflected in XML); because
setOvercast is still broken (and there's a question over setFog as
well), the mission param is disabled, as is all the relevant code in
f_setMissionConditions.sqf.
ReadMe.md changes

(Prep for v3-0-2).
Fixes for OPFOR uniforms and Ifrit name change
ReadMe.md changes
Merge pull request #18 from ferstaberinde/dev

v3-0-2