Minimal install of codecore library; use current version - #1619

The behavior of install_dir is specific in Vala, see https://mesonbuild.com/Vala.html#building-libraries

@tintou Thanks for the info - the meson manual seems a bit contradictory/confusing with regard to the install_dir keyword parameter. Is issue #635 a valid issue that needs addressing? Do some versions of meson not accept the array of booleans?

Beyond that, do we need to publish the codecore library as a package at all? We do not support third-party plugins now. As far as I can tell the core plugins only need to find the .so file - they do not need the ,vapi, .deps or h files. My last commit removes the installation of these and Code still builds and runs normally. Or is this a step too far? @danirabbit thoughts?

array of booleans is supported since a very long time (I think since Meson supports Vala so almost its inception)

@tintou Thanks for clarifying and closing the issue. I'll leave this as draft for @danirabbit to comment on whether we want to continue publishing the codecore package.

@tintou Just to check - if we are not publishing codecore as a Vala library do we need the array of booleans - or are there other advantages to keeping the array?

If we are not allowing out-of-tree plugins there is no need to install the header/gir/vapi indeed