Made rotation continuous

modulo 2*pi; earth angle always will be [0,2*pi]
Fixed planet rotation

* Added two way rotation code ('R', 'T')
* Updated so gPlanetPosW is set for each planetary shader
* Updated so v3Pos = vout.PosW.xyz - gPlanetPosW instead of vin.PosL for
all planetary shader code.
Updated unused space.fx

To reflect the planetary position/rotation changes.