Add a wiretap file format reader to read rtpdump files.
Generates "Exported PDU" data from the header of the rtpdump
file.
Add MIME file format read support for rtpdump files.
Change the default extension for exporting rtpdump files to '*.rtp' as
per the rtptools project's recommendation.
Wireshark generates rtpdump files slightly differently from how rtpdump
itself works. Both the wiretap reader and the MIME reader examine the
text and binary headers to determine the most appropriate presentation
of information to the user.
Guy Harris