Fix unit selection hotkeys for players. Fixes #5753.

This also explicitly disables them for spectators.
Fixed 'seven-stairs' and 'room-warzone'
Added the abiltity to load WVec[] from MiniYaml
send player names to master server
Applied VWec[] yaml loader
Add ITraitInfo constraint to Requires<T>
Makes LineBuild logic require building dimensions of 1x1
Inform client about changes in lobby options
Added flag to Mobile/AircraftInfo: MoveIntoShroud.
Does not change the audio feedback given.
Fix instant-use and AllowMultiple support powers.

Fixes #2185, #6090.