WSUG: Convert ``Command Line Tools'' to AsciiDoc.

Move the idl2wrs section to the Developer's Guide. Leave most of the
other content intact for now.

Change-Id: I98c6eeab62af5cc55e3ce23ab1107df02b1a22cf
Reviewed-on: https://code.wireshark.org/review/5214
Reviewed-by: Gerald Combs <gerald@wireshark.org>