fix: orbit indicator is continuous

fix: orbit indicator is a line

fix: orbit prediction follows hill spheres

Merge branch 'master' of git.srht.e3t.cc:~starkingdoms/starkingdoms

fix: trying to fix gravity

feat: solver optimization (pro tip: do not do io in the hot path)

feat: switch solver

feat: more predictable thrust solver behavior

feat: orbit prediction

fix: world config is on client too now

fix: orbit predictor is now actually positioned correctly on the screen

fix: orbit predictor is scaled and positioned constantly on hte screen

fix: orbit background fills the screen as it should

fix: zoom to projection x2

fix: zoom uses projection now

feat: orbit predictor is in the background

feat: hearty in starguide

fix(milp): improve predictability of solver

fix(starfield): give the sun it's soul back

feat: add orbital info to config