Add v1.0 of lookupFunctionArgs which looks up a function by name

and example argument list in a given class or namespace, with
function overloading performed on the argument list.  Template
argument deduction and template instantiation are both supported.


git-svn-id: http://root.cern.ch/svn/root/trunk@44102 27541ba8-7e3a-0410-8455-c3a389f83636