Allow accurate rotation, orbit and scale for objects

[oknuutti]

There are several fixes and enhancements that was needed for our application in order to be able to view near earth asteroids when passing close to Earth. In short:

First commit

• Objects were not rotating correctly, this was fixed

Second commit

• Upgrade to new version of three.js (0.173.0) allowing webgl2
• Fixed bugs where rendering related resources were not freed when unloading
• Fixed the orbit of the Moon
• Support custom onclick handlers for object labels (we used this to switch focus to the clicked object)

Third commit

• Cleanup code was refactored
• Support toggling the visibility of objects
• Support for ephem tables given in body relative coordinate frame, allowing high accuracy orbits for close approaches
• Possibility to show a sprite when far from a body, changing to actual shape model when the object is viewed close enough, allows the objects to have correct 1:1 scale as they can still be found even when viewed from far away

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