Fix encoding-arg mostly for FT_UINT_STRING; Also: Do misc as needed.

Misc: (as needed)
- Add editor modelines;
- Adjust whitespace.

Change-Id: I0e5d877a2a6273842ad8e771ac0c0acbfcb83200
Reviewed-on: https://code.wireshark.org/review/4173
Reviewed-by: Bill Meier <wmeier@newsguy.com>