Docx printer / formatter

[traut]

Design

Given DOCX file with placeholder variables (and actions if possible), produce a DOCX file with all placeholders replaced with values.

• investigate the possibility of using Go-templates syntax
  • there might be difficulties in detecting the control sequences (as mentioned here)
• support for images / graphs is not in the scope for this first iteration

This issue depends on #262

References

• https://github.com/lukasjarosch/go-docx
• https://github.com/unidoc/unioffice (commercial license)