In framework/inc/stdtypes.h. class OUStringList.

Removed inheritance and separated additional functionality into more general
functions. Changed to using std::vector<OUString> rather than SequenceAsVector.

The functions now work for any vector. Although they could be made more general
and support any container by altering the arguments.

Change-Id: I472267029dc69da1ad0a98d55e26e3784f6b07cd
Reviewed-on: https://gerrit.libreoffice.org/13612Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>