let dav1d_version() return the project version
Increments the soname revision number for this behavior change. Removes the DAV1D_VERSION and DAV1D_VERSION_INT defines from the installed version.h header. Marks dav1d_version_vcs() and dav1d_version_int() as 'Do not use'.
Also cleans up the version usage in dav1d CLI.
Refs #241 (closed), #255 (closed).
Edited by Janne Grunau