Add support for East Asian (CJK) font name property.

API Design

• font.name_far_east — str or None (the East Asian font name)
• font.name_east_asia — alias for the above (matches OOXML terminology)

XML

w:rPr > w:rFonts with w:eastAsia attribute (alongside existing w:ascii, w:hAnsi, w:cs)

python-docx currently only exposes font.name which maps to w:ascii and w:hAnsi. The eastAsia and cs attributes are not accessible.

Also add:

• font.name_cs — Complex Script font name (w:cs attribute)

Upstream: python-openxml#154 (9 comments), python-openxml#346 (8 comments), python-openxml#329 (6 comments)