first attempt at getting something to give me an angular readout of a
rotating vessel.
fix error when calculating RCS forces in rotation mode.
Try to calculate the moment of inertia.

Not satisfactory though, since it doesn't seem to match ingame
behaviour.
Show vector magnitudes, something i thought it could be useful for debug.

It isn't though.
Merge branch 'master' into angular-speed
move angular velocity debug code to Debug.cs
Merge branch 'master' into angular-speed

Conflicts:
	LineRenderer.cs
	RCSBuildAid.cs
Merge branch 'master' into angular-speed
Make vector circle size proportional to angular acceleration
Refactor of VectorGraphics and TorqueCircle.

Make their size change more smoothly with their magnitude.
fix units
fix, not using the correct axis for angular speed calculations
some more debug info
raise TorqueCircle.lowerMagnitude a bit.
fix MOI calculation resulting zero when torque is zero.
move DebugValue to Debug.cs
add a Debug menu and add make some debug options toggleable
raise TorqueCircle.lowerMagnitude a bit
code trim
when MoI is zero, circular arrow indicates torque.

also fixed some arrow flickering and a NRE.