printers.py (SingleObjContainerPrinter): New base class for experimental::any and experimental::optional printers.

	* python/libstdcxx/v6/printers.py (SingleObjContainerPrinter): New
	base class for experimental::any and experimental::optional printers.
	(StdExpAnyPrinter, StdExpOptionalPrinter, StdExpStringViewPrinter):
	New printers for Fundamentals TS types.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: New.

From-SVN: r212556