[bug] fontFamily viewerOptions doesn't work

[charnould]

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Expected Behavior

fontFamily should allow modifying canvas font-family.

Current Behavior

It doesn't work.

Steps to Reproduce

1. Clone public repo: https://github.com/charnould/sanddance-bug-1.git
2. Open index.html with Liver-server to avoid CORS issue
3. See that canvas font is sans serif
4. See that source code indicates fontFamily: "Monospace" --> That's the bug!

Expected result

Canvas font should be Monospace