Frontend: Remove ugly border from gameflag button images

Racer: Remove a few ammo types that could break the gameplay

Update Traditional Chinese frontend translation

Racer: Really fix delay confusion when attempting to force-disable gfKing/gfPlaceHog For real this time. The previous attempt to fix this was shite.

Racer: Fix weird water splashes after waypoint placement Does not affect official racer, as only waypoint placement is touched. The reason was that the air attack gear sometimes was not deleted fast enough so it might occassionally drop some air bombs (these are deleted now). Also, the airplane position was set to water level, which caused another water splash.

Set Racer scheme turn time to 90 to match Racer script's

GameServer: Hide saveroom and loadroom command in non-official server Because those commands only work with OFFICIAL_SERVER

Remove accidental air mines in official racer challenges

Update game schemes in racer.yaml to re-enable invuln in Racer

Update changelog

Racer, TechRacer: Mask taunts like Stupid when track was completed successfully

Racer: Fix ammo delay confusion if gfKing or gfPlaceHog were set

Racer, TechRacer: Force-disable several bad game flags

Set crate probability to 0 in Racer game scheme

Racer: Make winners invulnerable