Removed awkward nsXPTParamInfo::GetInterface and friend, and als removed supporting nsXPTParamInfo.cpp file. Replace by nsIInterfaceInfo::GetInfoForParam and friend.
Made the constructor for nsInterfaceInfo private, with nsInterfaceInfoManager as a friend class.
Progress on the nsInterfaceInfoManager typelib loader for xpconnect.
Now has complete (I think) functionality, though the implementation is
still probably rusty.
I punted on defining a directory for .xpt files at this point; the
implementation looks at the value of the XPTDIR environment variable
for this value.
Note that the nsXPTParaminfo interface (public/xpt_cpp) has changed
(possibly temporarily) to take an 'entry' parameter.
Moved nsInterfaceInfoManager files from the libxpt directory (where
they would have precipitated an unpleasant circular dependency between
xpidl and nsISupports.h) into a new subdirectory.
Added corresponding entries to allmakefiles.sh.
nsInterfaceInfoManager is intended to abstract the loading and
management of typelib information generated by xpidl, for use by
xpconnect.
