Fix TClingTypedefInfo::Init to actually support typedef.

Replace the call to findScope by a call to findType
as not all typedef are scope and findScope (without
the optional argument) strips the typedef anyway!
Fix TMetaUtils::GetFullyQualifiedType in case the type is a RecordType of template specialization
Restore Parser state before committing the associated transaction.

In LookupHelper::findType, we switch the RAII for the transaction
and for the parser so that the parser state is restored before
the transaction is committed.   This fixes the execution of

 gROOT->GetListOfTypes()->FindObject("deque<ROOT::TTreeReaderValueBase*>::_Alloc_value_type"); gROOT->GetListOfTypes()->FindObject("deque<ROOT::TTreeReaderValueBase*>::const_iterator");

When both statement were in the same transaction, without this
change, the 2nd one would return (incorrectly) zero.
Replace the container used for GetListOfTypes with one with lookup.

Rather than filling the ListOfTypes with all the known typedefs
we now fill the list on demand by replace FindObject with
a routine that does a lookup if the typedef is not yet in the list.

This improves the behavior as the FindObject now finds the
typedef even if the spelling is not exactly the normalized
spelling.

This will reduce the memory used and also avoid having to
deserialize all decl that might (or might not) contains
typedefs.

In addition, the existing implemenation had several (fixeable)
deficiency (using getNameAsString rather than the routine
creating the normalized name) lead to duplicate entries
being created (because it looked for nestedtype rather than
outer::nestedtype).

More over it was missing some fo the typedefs (like for example
TOrdCollection::Iterator_t).   Whenever HandleDeclNew saw
TOrdCollection it was always empty (HandleDeclNew was called 4 times
with TOrdCollection during the startup).

Add TInterpreter::TypedefInto_Factory(const char*name)
Remove obsolte 'load' of list of types. Update doc
Now that GetListOfTypes has a lookup, no need for shortening the name
Merge in the ListOfTypes replacement.