OLLbase: Use fontspec and xcolor
Remove symlinks to lilyglyphs and musicexamples

These packages aren't used by OLLbook anymore (to minimize
dependency and package loading), therefore it's no use having
the links in the repository itself (they create "dependencies"
wrt directory structure).
If a document explicitly uses one of the packages the user has
to explicitly care for the packages being available (lilyglyphs
is available through the distros anyway).
Make OLLbook aware of options

Use \LoadClassWithOptions to enable individual configurations
such as oneside and other layout options
OLLbase: Some cleaning up

Integrate fontspec directly and set some stuff about fonts
Update copyright notice in files.