Make hog kill stat stuff consistent WRT SD water rise

Fix hog taunts counting SD water rise drowns as team kills (bug #691)

Comment all important variables in uStats

Target practice: Change target radar color to red

Highlight next target for most target practices

ACF5: Delete circles vgears after wave3 appeared

Keep track of accuracy record in target practice challenges

Remove "loser" messages in challenges The point of challenges is not to "win", but to reach a highscore, so we need not to rub failure into the player's face.

just focus on the unsafe deletes in a hopefully branch-safe fashion

aaagh can't just move delete like that due to our RNG scrambling... reverting on branch. we'll just have to take our chances w/ the bad code