writerfilter: hardcoded sprm:PContextualSpacing

Change-Id: I35f111dffe44cabe8cdfa65067695dcd6c7517e7
writerfilter: hardcoded sprm:PFMirrorIndents

Change-Id: Ic8624a90ac71f03360e18ca6de589040493ccc1e
writerfilter: hardcoded sprm:PFNoAllowOverlap

Not that it would be handled on the dmapper side.

Change-Id: I80c338933fd7ecdbdd9e8541ce30887375b19929
writerfilter: hardcoded sprm:CFspecVanish

Change-Id: I7766dd3144ff84f292de1e207dc3a432719d0ec3
writerfilter: these SPRM's are unused

Change-Id: I60013801e22b8a17d9fb7378fd9bd7f828610710
writerfilter: whitespace fixes in RTFDocument

Change-Id: I7cd294b42fa402e4da254fe6a2239c9d9293588b