basic .docx write support for embedded fonts

Docx embedded fonts now should be usable for practical use,
although there is still a number of small todos:
- fonts are embedded when saving only if the document had embedded
fonts when it was opened (this means the document needed to be
saved in MSO first with the option enabled), there's no UI
to enable it and it's a question if it makes sense on Linux
- w:embedSystemFonts is similarly questionable, given that the spec
is very vague on what system fonts are supposed to be
- font subsetting is ignored, when reading a document, the font
is simply used and it is hoped it will work (that should mean
the document should not be modified, otherwise glyphs may be missing
for the new text), write has no support for subsetting; also, since
fonts are global for LO, opening several documents with the same
but differently subset font probably will not work

Change-Id: I470a9f2857738a10e82546223412bd9320841e65

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