grafx - Extensible Java Graphics Package Code

Removing hashCode() from ClipRectangle because I don't like all of these
Java-isms. In fact I'm almost ready to jump ship and try Rust or D.

Removing equals() and hashCode() from FloatColor because it is mutable.

Removing SHORTTERM-TODO.txt because it's done. The integer and 64 bit long
representations of FloatColor don't belong at that level. That would go
somewhere else.

Adding hashCode() to both ClipRectangle and FloatColor. And... [drumroll] ...
I think we're done with 2D for now. Time to focus on correct z computations.

Adding an equals() method to FloatColor.

Updating SHORTTERM-TODO.txt with an item done.

Some changes in comment formatting and content. Very minor stuff.

Fixing a slight error message spelling mistake. In polygon-filling routine,
renaming local variable from 'y' to 'yy' to match the naming scheme used in
drawPoint() and drawLine(). Making a public-like method Javadoc comment more
private-like.

Making use of ArrayPixBuff. The 2D rendering code is now greatly simplified.

I will be making strides at reducing the length of 2D rendering code; I intend
to pipe all calls through the m_customPix, and never touch m_pix directly. The
first step in this is of course to implement an internal class such as
ArrayPixBuff, which is exactly what I am doing here.