Add color option to hexdump() for coloring based on bytes

[Schamper]

For example:

• 00 is darker
• ASCII characters are a certain color (different for lower/upper case/numbers)
• Other color for printable/non-printable

Image for inspiration:

(From http://thestone.zone/hacking/2019/01/01/hacking-quest-for-glory.html)

_{the search for chex is real}