more darts fixes
- thrown darts stick into the board better, with more accurate point-tip rotation
- scores now wipe and restart instead of scrolling
- switched dart score sending to client authl, there's no stakes so it's all good to do so
- zoom is now permanently enabled
- busted turns grey out the text on the scoreboard to indicate that it was a bust
- added second collider to the board for better dart collision (was going through board rarely)
- prefab fixes and tweaks