~kmdodrill/little-planet

Add helper arrow, and some controls info

* fix mouse reset bug
Add support for macos
Add displacement shader

* instead of drawing the same sprite 10 times each, use a displacement
  shader to animate the faces
Add orbits for planets relative to sun
Add default font, add draw center func
Zoom camera out when near planet, use lerp
rework animated_sprite_create

* add new planet
fill out animated_sprite code
Add animated sprite functionality
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