Fix some ETag support for AWS
Return correct value for getElapsedSeconds() post-match
clearEntities(): Arrow->Projectile
Commands should return false when failure.
FoodLevelChange for HUD
Weird special case: Player falling into void in lobby.

Also handle players spawning in worlds that shouldn't exist.
Only check item elevators for actual game players.
Merge branch 'HEAD' of https://github.com/rmct/AutoReferee.git
Half-complete JSON match report implementation.