writerfilter: unused NS_rtf::LN_{FLEGAL,BRCTYPE,DPTLINEWIDTH,DPTSPACE}

Change-Id: Ia88c495cf83081fecfa95916fd76cfdf04d08014
writerfilter: unused NS_rtf::LN_{FSHADOW,FFRAME,IBKL,FCONVERTED}

Change-Id: I61dae1364951cb015b3f302bc0d88764748de13c
writerfilter: let the OOXML tokenizer not generate RTF tokens

The tokens were in 3 namespaces previously: sprm, ooxml and rtf. Given
that all rtf tokens have ooxml equivalent but not the other way around,
replace remaining rtf tokens with ooxml ones (in the OOXML tokenizer) to
make this area a little bit easier to understand for a newcomer.

Change-Id: I640ecf51b0f88da2cdf41e8e79cf44b4ddbffef4