Previously we were using the env! macro to determine
build-time variables like version, app ID, and locale dir.
Instead of relying on env vars, we can create a configuration
file with meson and import it.
This is not supported at all, and it still won't run with cargo
run, thankfully, you should use meson instead...
The only purpose of this commit is to make it possible for
cargo check, and by extension rls, to function and work
properly.
Part of #110
This adds a configuration option in meson, if set it changes the
application ID allowing for stable and development version to be
run at the same time.
