Improvements to SpotLight3D and OmniLight3D's shadows

OmniLight3D:
* Fixed lack of precision in cube map mode by scaling the projection's
  znear.
* Fixed aliasing issues by making the paraboloids use two square regions instead of two half
  squares.
* Fixed shadowmap atlas bleeding by adding padding.
* Fixed sihadow blur's inconsistent radius and unclamped sampling.

SpotLight3D:
* Fixed lack of precision by scaling the projection's znear.
* Fixed normal biasing.

Both:
* Tweaked biasing to make sure it works out of the box in most situations.

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