Add an Unload voice for when a unit is unloading.
Merge pull request #3591 from ScottNZ/voices

Add an Unload voice for when a unit is unloading.
changed: RA map PLUTO

-- fixed # 3573
-- removed MISS
-- changed MSLO so that it is possible to possess multiple ones.
-- added additional MSLO to the map.
-- removed a couple of oil derricks.
changed: RA map ARTEMIS

-- minor changes
More improvements to nod01
Fix BibLayer style nits.
tweaks and such, nod01
Merge pull request #3593 from wuschel/bleed

Fixes #3573 and updates maps Pluto/Artemis a little.
corrected lose fmv nod01
fixed strange indentation nod01
Add FrozenUnderFog property to BibLayer.

Note: This implements the desired behavior
for FrozenUnderFog, so is still inconsistent
with its current (broken) behavior.
Fix SmudgeLayer style nits.
Freeze smudges under fog.
Fix ResourceLayer style nits.
Freeze resources under fog.
Use the rendered resource state for the harvest order targeter.
Hide explosions under fog.
Hide corpses under fog.
Hide smoke under fog.
Hide Repair, Powerdown icons when cloaked. Fixes #3588. Fixes #3502.