reduce construction yard cooldown to 3 seconds

While not crucial, the extra second kind of is annoying and gets in the way of gameplay.
changed nuke launch sound

Someone complained that there was not good warning for the nuke. All you heard was the launch sound, which wasn't that noticeable and a bit like other sounds.
Now it says, "nuclear missile approaching".
Merge pull request #3244 from pchote/bot-surrender

Improvements to player drop behavior
Buff mammoth tank cannons and missile launchers
Increase CA ROT and speed. Increase its damage spread and accuracy.
Increase badr and badr.bomber healths
Make mines targetable and removable.
Let AP mines do damage against vehicles.
Let all mines do damage against friendly units.
Merge pull request #3243 from ScottNZ/balance

RA Balance (destructible mines; badr and mamooth and cruiser buff)
Merge pull request #3246 from psydev/cnc

cnc touch-ups
Merge pull request #3238 from pchote/local-pause-state

Remove local pause order lag delay
Don't modify C&C options menu subtitle when opening the lobby.

fixes #3249
Fixes fix for #3249.
Improve setting the lobby server title.