This is in preparation for more conversion of SvStream::operator<< calls
to use more explicit method names.
This converts the subclasses that have their own convenience overloads
of operator<< to use normal methods.
Change-Id: I5efd5d9a24c264cb86d2471303dd5849bf91ba80
partial revert of 743e627bcfc9c87d806109fe6f3f4e2817b73dda
because we want to use that then unused code now
Change-Id: I94fe173dda053ce1b72b3b776a9855ce9ecc249b
see https://gerrit.libreoffice.org/#/c/3367/
and Change-Id: I00c96fa77d04b33a6f8c8cd3490dfcd9bdc9e84a for details
Change-Id: I199a75bc4042af20817265d5ef85b1134a96ff5a