kitkat clock in Rust

This is the plan9 cat clock utility rewritten in rust with minifb crate.

```shell $ kitkat --help Usage: kitkat [--hook|--crazy|--offset OFFSET|--borderless|--resize|--sunmoon|--moon|--date]

Displays a kit kat clock with the system time, or the system time with given offset if the --offset argument is provided.

  --hook                 show a hooked tail instead of the default drop shaped one
  --crazy                go faster for each time this argument is invoked
  --offset OFFSET        add OFFSET to current system time (only the first given
                         offset will be used)
  --borderless
  --resize
  --sunmoon              show sun or moon phase depending on the hour
  --moon                 show only moon phase
  --date                 show month date
  --dog                  show an italian greyhound named Gaius Octavius Maximus instead of a cat

  OFFSET format is [+-]{0,1}\d\d:\d\d, e.g: 02:00 or -03:45 or +00:00

```

Demo

![demo](./kitkat-round.gif?raw=true) ![demo](./kitkat-hook.gif?raw=true) ![demo](./kitkat-resized.jpg?raw=true) ![demo](./dogkat.gif?raw=true)
Default drop shaped tail. Hooked tail with `--hook`. Resizable window with `--resize`. Dog instead of cat with `--dog`.
![demo](./kitkat-date-and-sun.jpg?raw=true) ![demo](./kitkat-moon-phase-only.jpg?raw=true)
Showing current date and sun/moon phase status. Showing just moon phase status.

References