feat: avian!

feat: bevy 0.17

Merge branch 'core/rewrite-it-all-again-lmao' into 'master'

unified

See merge request starkingdoms.tk/starkingdoms.tk!5

feat: fuel exists, but does nothing

feat: drag ghosts and snapping

chore: code cleanup

chore(part): part fix #1

fix: parts

feat: part & attachment beginnings