Reapply "fix: anchors"

This reverts commit e10f9c6272c3a1abdf197eb056cbc79a9c3109ca.

fix: part hot reloading

Revert "fix: anchors"

This reverts commit 04beb9f36db6a39a3be1263a79cdf80af900dbe0.

fix: anchors

fix: input

feat: basic part functionality

chore: code cleanup

chore(part): part fix #1

fix starfield alignment(?)

chore: fix gravity

work on planet textures

spawn on earth

chore: fix more things

stabilization iterations

planet positions and gravity changed

chore: fix warnings

fix: parts

fix: parts

feat: part & attachment beginnings

feat: drag