third GDI mission recreated in Lua
launch a Nod attack after 15 seconds
lint check maps, too

closes #4187
removed bogus rules for the immobile bombs
Merge pull request #4857 from pchote/ra-balance-changelog

Add changelog entry for Radar Dome cost tweak.
add a spectator player that shares shroud with everyone

closes #4607
Merge pull request #4656 from Mailaender/everyone-shroud

Added a spectator player that shares shroud with everyone
moved internal time step setting to Game

player should not be able change it as it is not synced yet
add a pause/slowdown/play/fastforward button for replays

closes #4633
separate World and Ui LastTickTime
use relative tick time intervals
keep the catch up for small delays and truncate larger ones
Add some more robustness against UI-introduced desyncs.
Adjust C&C replay UI.
Tick the game timer status independently of the game rate.
Fix the timestep jank threshold.
Let radar dome detect cloaked units
Let attack dog detect cloaked units
Let mobile radar jammer detect cloaked units
Let cloaked units optionally uncloak when unloading