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

batch spawning particles

sampling now clamps to the end of the spline correctly

scaling added, along with fixes to sampling

more insanity

i'm going insane because of rebase