Since we require meson 1.3(.2), we can modernize the usage a bit,
as well as improve some logic
- use / instead of join_paths
- use option.allowed() instead of !option.disable()
- use cxx.get_supported_arguments
- use fs.copyfile instead of configure_file
- show a summary at the end of the configuration
mu embeds a "vendored" version of libcl11 under thirdparty/; but it's
better to use the system-package if the user has one.
So, use the system package if found or user -Duse-embedded-cli11=true is
specified.
This implements the new scm/guile bindings for mu, to replace the deprecated
guile/ (at some point in the future).
For now, we allow for creating a guile shell with mu support.
Implement a new command-line parser, based on CLI11.
It's a bit more C++'ish, and allows for a lot of fancy things... some of
which we have implemented here.
Update the various commands to use the new Options struct
Remove the old help strings; instead e.g. `mu help view` opens the
manpage.
Integrate the guile scripts more tightly.
