grafx - Extensible Java Graphics Package Code

Adding helper class 'MatrixUtils' to package 'com.nerius.grafx.d3.demo'. At
lease two classes in same package (demo code) will likely be making use of
this.

Removing a TODO.txt item that has already been completed.

Fixing GrafxPolyFillDemo to work without java.applet.Applet.

Updating PolyhedronDemo to do away with usage of java.applet.Applet. I think
this works, even though there was one small hiccup recently; there may be some
thread safety issues still lurking somewhere.

Changing order of member variable definitions, used to be m_anim, m_grafx, and
m_img; it's now m_grafx, m_anim, and m_img.

Correcting some spelling mistakes in CanvasAWTAdapter, which are in comments.
'insure' -> 'ensure'.

Fixing GrafxLineDrawDemo to be standalone.

Converting SimpleDemo in package com.nerius.grafx.d2.demo to use FrameAWTStub.
This is no longer a java.applet.Applet. It now has a main() method.

Creating a zero-arg FrameAWTStub constructor.

Removing TestFontFactory which is mostly dead code.