Fix unit selection hotkeys for players. Fixes #5753.

This also explicitly disables them for spectators.
Fixes Maps not being able to force tech levels
Merge pull request #6105 from WolfGaming/FixTech

Fixes Maps not being able to force tech levels
Fixed 'seven-stairs' and 'room-warzone'
Added the abiltity to load WVec[] from MiniYaml
send player names to master server
Applied VWec[] yaml loader
Merge pull request #6111 from abcdefg30/fixmaptiles

Fixed 'seven-stairs' and 'room-warzone'
Add ITraitInfo constraint to Requires<T>
Merge pull request #6102 from ihptru/masterplayers

send player names to master server
Merge pull request #6121 from ScottNZ/bleed

Add ITraitInfo constraint to Requires<T>
Merge pull request #6113 from atlimit8/FieldLoadWVecArray

Load WVec[] from MiniYaml
Merge pull request #6098 from pchote/select-hotkey

Fix unit selection hotkeys for players.
Makes LineBuild logic require building dimensions of 1x1