writerfilter: remove unused XSL templates

Change-Id: Ie0f7cbaf2061894bea6589073f619ed15d0201ec
writerfilter: RTF_LOCH is not a NOP anymore

Change-Id: I06297a0c88c931cbc95e24de472d43339fd5116f
writerfilter: document what RTFParserState's LO/HI/DBCH does

Change-Id: Iee70bfdecafb28a56440e5a4bf6d7ace54ea6436
oox: replace redundant STATIC_ARRAY_SIZE macro with SAL_N_ELEMENTS

Change-Id: I8cf274902bb5fda9fa70ab2af9e399db82d85d1d