... into a string specifying a kind of encoding (utf8, latin1),
an optional bytesize (2-byte integers, 4-byte integers) and a
flag whether the displayed value should get "..." around it.

Scales better than adding an enum value for each new combination.

Change-Id: Iffcb1e2f148f12da96e165559a976bd34026c649
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>