Improved controls

[throckmorpheus]

• Roll the camera with the vanilla flight roll controls, so it works on controller
• Change move speed exponentially instead of linearly, so it doesn't take so long to get between 'moving around at a player scale' speeds and 'moving around at a planetary scale' speeds (and you can get slower than the old minimum, for looking at things up close)
• Use tool up and down as secondary speed controls, again for controller purposes
• Fixed things not being scaled by (unscaled) delta time, inverted axes, etc, so it controls more like the player camera

Also tweaked some things with the parenting while I was at it:

• Teleporting to the player now parents you to the player camera rather than body, and matches the player's rotation
• You get parented to the player by default on start instead of ending up floating away vaguely nearby at the world origin
• You can use Y to switch parent without teleporting, useful for switching between the player and the planet they're on etc