Separate out "awt" libraries from Awt2dLibraries.gmk

The file to build most of the java.desktop native libraries, Awt2dLibraries.gmk, is large and unstructured, making it hard to navigate.

I want to split it into two parts, one for the AWT libraries, and one for the 2D libraries. I also used this opportunity to change the order to be more logical (e.g. grouping "image" libraries and "font" libraries in 2D).