Release 0.56a

Removed references to "geo"stationary and "geo"synchronous orbits of
anything other than Kerbin. They are now just stationary and synchronous
orbits.

In response to previous change, renamed geostationary and geosynchronous
orbits around Kerbin to keostationary and keosynchronous.

Introduced the terms keliostationary, keliosynchronous, and Kolniya for
konsistency.

Orbits no longer even consider generating at any inclination above 180
degrees. This fixes impossible to match orbits from appearing.

Retrograde orbital objectives for Kerbin and the Sun are now much rarer
at lower difficulties. For other bodies, they can still appear at
random.

Orbits are now generated when satellite deployment contracts are
generated, rather than on every scene change. This is better for
compatibility and performance, but more importantly, it allows me to
show orbital parameters in the mission briefings for people that need to
see numbers.

Visual orbits got an art pass. Revolving icons are now much smaller,
resulting in the appearance of a pulsing line. There are now icons for
apoapsis and periapsis with accurate tooltips.

If you are in orbit of a body with a satellite deployment contract orbit
around it, ascending nodes and descending nodes will show on the mission
orbit that show where you need to burn normal to match inclination.
These also have appropriate tooltips.

Tweaked how textures get loaded to save myself some RSI in the future.

Tweaked some small backend stuff with existing waypoints - including
ground and aerial.

Tweaked the waypoint renderer.

Tweaked some backend stuff with orbital parameters. All of this small
tweaking will be important when I introduce configuration.

Condensed all four orbit generators to one reusable one.

Objective orbits now properly calculate specific angular momentum. Just
nod your head and smile.

Matching an orbit now requires you to also match argument of periapsis,
fixing an issue where very rarely you could complete a contract using a
vastly different orbit.