Commits on Jun 27, 2022

1. Add cargo-style output diagnostics. …

   Adds the quiet and color command-line flags, where color supports `auto`, always`, and `never`. These command-line flags are parsed to a verbosity which can be quiet, normal, or verbose.
   
   With these, we then have the stderr message formatters:
   - `fatal_usage`: print a fatal error message with the failing argument, and add a help context menu for how to use cross.
   - `fatal`: print red 'error' message and exit with an error code
   - `error`: print red 'error' message
   - `warn`: print amber 'warning' message
   - `note`: print cyan 'note' message
   - `status`: print an uncolored and unprefixed 'status' message
   
   We have the stdout message formatters:
   - `print`: always print the message
   - `info`: print the message as long as the verbosity is not quiet
   - `debug`: only print the message if the output is not quiet
   
   We also have a few specialized error handlers, and methods to help ensure we can have flexible error reporting in the future:
   - `status_stderr`
   - `status_stdout`
   
   The command extensions now have, `print`, `info`, and `debug`, which formats the command and sends it to the shell. This allows us to avoid using `print_verbose` where we sometimes manually override the default setting.
   
   Closes cross-rs#797.

   

   Alexhuszagh committed Jun 27, 2022
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