Fix end game window conflicting with ingame menu

Fixes #6311
Port gdi04c to New Lua
Fix D2k infantry death sequences.
Fix wrong sequence lengths
self-document and un-hardcode the prone sequence prefix
remove unused duplicate stand sequences
remove bogus tab
fix infantry without idle anim staying in fire animation state

closes #5884
add missing TakeCover trait
replace bogus tab with space
Port nod03a to New Lua
Fix a typo in gdi02
Port nod03b to New Lua
remove bogus space tabs
refactor and move ShipUnitTypes to the top
Disconnected clients now listed as '(Gone)'.
make this a seasonal easter egg
avoid magic numbers
use the new reinforcements methods
bring back Chinook infantry insertion