doxygen: automate versioning and names

Removes the need to maintain the project name, version and source
directory in the doxygen files.

API and ABI versions should be in one place only.

Change-Id: If26c7ac1166b519d0ceae91b3656b55c4601b52d
Reviewed-by: Sebastien Blin <sebastien.blin@savoirfairelinux.com>