Docx Reader: Added recognition of sym element in paragraphs
lib: Added symbol.txt and file to generate codepoint to unicode mapping
Added Text.Pandoc.Readers.Docx.Fonts
Added test for sym element
Docx Parse: Recognises code points in sym elements which are in the private range
Docx Tests: Updated for reading sym element
Merge pull request #1509 from jkr/symbol

Parse "w:sym"