- remove "ran-" prefix from touch files as it's redundant since the
they're already in the directory named `touches`.
- Include `contrib` when formatting with `make formatlua`.
- Use TARGET_FILE generator expression instead of assuming the
executable location.
- reuse logic that determines whether to use lua or luajit.
- add translations to the `nvim` target.
Makefile improvements:
- rename variable `CMAKE_PRG` to `CMAKE` to make it more consistent with
the builtin `MAKE` variable.
- stop propagating flags to generator. Users should use cmake for
non-standard use cases.
- remove `+` prefix from targets. If the user for whatever reason wants
to dry-run a target then they should be able to.
