writerfilter: remove unused WW8PropertySetImpl in doctok

Change-Id: I42e7fbc62d455d909f50864371a321058d4ac2ad
writerfilter: remove unused xmigen in doctok

Change-Id: I23110e5ab98068c2e046c6f6539759a1dc6d1191
writerfilter: remove unused replacesprmids in doctok

Change-Id: I28970c5bd919640bb3b5dd6ac38d93673cce1002
writerfilter: remove unused WW8xmi in doctok

Change-Id: I61cf2a40f80f27005229b4a06f3c1e32802be4cd