Changes the default fetcher in the Rust Platform to be the newer
`fetchCargoTarball`, and changes every application using the current default to
instead opt out.
This commit does not change any hashes or cause any rebuilds. Once integrated,
we will start deleting the opt-outs and recomputing hashes.
See #79975 for details.
The default pager for `bat` is `less -RF --no-init`. Overriding this to
`less -RF` in order to enable alternate screen behavior (e.g. page
up/down keys) causes the `-F` flag to behave badly in the version of
`less` shipped on macOS. The simplest way to fix this is to simply put
Nix's `less` into the `PATH` so it takes precedence.
Remove zlib, this is no longer a dependency as of at least 0.12.0.
While we're at it, switch to using installShellFiles to install the
manpage/completion.
