grafx - Extensible Java Graphics Package Code

Renaming class com.nerius.grafx.d3.demo.MatrixUtils to
com.nerius.grafx.d3.math.Matrices, and making it publicly accessible.

Renaming class com.nerius.grafx.d3.demo.VectorUtils to be
com.nerius.grafx.d3.math.Vectors, and making it publicly visible.

Starting to fill out Javadoc in BatchModeDepthGraphics.

Changing the order of things defined in DepthGraphics interface.

Adding BatchModeDepthGraphics. This is just the beginning.

Implementing getClip() in TiledDepthGraphics. This is done very elegantly by
taking a union() of all the clip rectangles.

Making some progress on the tiled rendering.

Trying to fix the clipping strategies, basing this code on the 2D improvements.

Simplifying the creation m_clipFoo by using bounded() function. These changes
are from a few days ago, just committing now. I was working on fixing the
clip dilemma in 2D graphics. The 3D code is about to be revised in that
respect, finally.

Getting rid of m_inverted in ClipRectangle. Simplifying the code.