Added file type determination (Load, Object, Library). Requires
screening the segment and record types.
Also, fix parsing of v0 headers, which placed ORG and ALIGN in
different places.
Added generation of info/error messages to segment parser, which
are displayed in the main OMF viewer window.
Added segment viewer window, which opens when a segment entry in the
viewer list is double-clicked. Currently shows the "raw" header
fields, with place-holder UI for additional stuff.