ship editor feat: detaching works ish

ship editor feat: shift clicking and regular clicking work how they probably should

ship editor feat: selection and deselection

ship editor fix: thruster attachment and connected part sprite

ship editor feat: attachment

ship editor feat: ghost snapping

ship editor feat: spawn hearty & eventually other parts

ship editor fix: working scrolling

feat: part list & dragging ghosts

chore: move ship editor to unified codebase