Update dependenceis

See merge request !58

Remove all usages of the legacy scheme syntax

See merge request !57

Use /etc/os-release for getting the OS version

See merge request !56

Migrate to libredox.

See merge request !55

Change escape charater to '?' in less.rs for dmesg

See merge request !54

tar: Fix decimal/octal mix up at file permissions

See merge request !50

Fixes, tests, and enhancements for grep (part 1)

See merge request !53

This doesn't do a lot for us here, but there are a lot more options
in even the most minimal of major grep implementations, so it makes
sense to switch over now before making things more complicated.

One thing we do get from this is combined short-form options (yay!).

This encompasses a few things:
1. Return 0 if there were matches and no errors (includes --help).
2. Return 1 if there were no matches (useful in scripts).
3. Return >1 if there were any errors, but wait to do so until all files
have been processed (useful when globbing over a busy directory, for
example).

Support for math functions

See merge request !52

Cleanup and modernization

See merge request !51