nuklear.h has been converted to C89 style comment blocks instead of the
amalgamation it was before (presummably a relic of the other
documentation system).
examples compile. more testing is required.
this commit adds the proper source file directory, so now doxygen picks
up all of the C files for processing. Some minor cleanup and file
exclusions have also been added such that things like `paq.sh` and sub
`Readme.md` files are not picked up.
Adds initial doxyfile for doxygen configuration. Has some basic settings
for getting up and running with decent results.
Also, the beautiful doxygen-awesome-css project has been included in the
makefile such that we can pull (on your own time) a nice package to make
the doxygen output so much prettier to look at than the default.
