These are implied values as they are the defaults in the XSD
for optional attributes/elements. However I've noticed that
I keep running into issues where Mac Excel/Word fail to open
a file unless an optional default is provided.
I'll just add them all to hopefully increase compatibility and
save painful file format debugging sessions later.
- support character spacing and kerning in run style
- support contextual spacing in paragraph style
- add title style to new documents
- fix en-us -> en-US typo