Updated links

Move DTD homes to www.astronaos.com. These may move to github in the future if I can figure out how to easily access them there.
Add ability to xquiz-gen to include the question ID for each question - this makes tracking down questions later easier.

v1.0.2 --- add examples; MS VS compilable version

Add an example question bank and quiz.
Visual Studio (2018) now fully compiles.

v1.0.1--fixes to bank operators

The + and += operator weren't returning a value prior to this release.

First public release

First public release of the xquiz library and quiz generation files.