Fixed some write_fields_to_stream() impls. Added curly braces to multi-line to_printer() impls.

Some write_fields_to_stream() impls were using put_int32() instead of
 put_uint32().

Adding curly braces to multi-line to_printer() impls allows the lines to be
 collapsed when viewing in editors (in C-style mode)

Checked with test streams.
Added IsoEditBox and IsoEditListBox