cut down on excessive checkins in some situations

Remove slot overcrowding, disable angle detection which isn't doing what I want.

Don't accept ROUNDFINISHED message twice. Fixes game hangs when half of teams quit game.

Try to prevent a situation where hogs embedded in other hogs/barrels/cleavers get stuck, by checking for gears overlapping on Y

Also shove using shotgun, switch off hat when not active hog

First pass at cleaver.

Two cavern templates which aren't horribly long to generate, produce pretty varying maps, and allow 48 hedgehogs gameplay