Good UTF8 replacements for non-printable characters

[raspi]

Figure out good replacements for non-printable characters when displaying ASCII-output (--format asc)

Currently we have some replacements such as:

• 0x00 is 'Ø'
• New line is '↲'
• Tab is '⇥'

Find more characters to be replaced.

Reference:
https://github.com/raspi/heksa/blob/4e2f793a1c1fd0a5883f2fbb463d37e0c6347381/pkg/reader/ascii_lookup.go

[Zhentar]

Unicode includes a block of characters for visual representations of control characters: https://www.fileformat.info/info/unicode/block/control_pictures/images.htm

[raspi]

Note for self: also investigate what are the default fonts for different distros/OSes in terminals so that those replacement characters exist in those fonts