Prior to this change, the x52cli man page was a manually created file
that was out of date with the source. Rather than update that file, and
maintain a separate document for the HTML sources, it makes sense to
consolidate both the HTML and manpage documentation to a Doxygen page
block within the source and update the Doxyfile to generate man pages as
well.
This change also removes the obsolete manually maintained manpage, and
falls back to Doxygen to build and install the manpage.
This disables the include file list and dependency graph in the file
view. In addition, the groups are updated to include `libx52` in their
names, to avoid any potential conflict.
[skip ci]
nirenjan