Clean up meson options
Lots of projects have been dropping the enable-
prefixes. gtk has no prefix (e.g. man-pages
), a build-
prefix (build-tests
) or an enable-
prefix (for all the backends, colord, etc.).
It also still uses true/false for the boolean options, but yes/no/auto for the tristate options (instead of true/false/auto, which other projects seem to get ported to, and I favor a lot).
Would be good to get this cleaned up and streamlined with other gnome projects.