Authors would like a better way of handling base64 encoded elements

[jafeltra]

Authors would like a better way of handling base64 encoded elements so they do not need to manage the base64 encoding themselves.

There may be multiple ways we could go about this:

• Add a new FSH keyword (like Base64(...)). This would require a FSH spec change.
• Automatically base64 encode strings that are on elements that have the base64Binary type. This would require first ensuring the string was not already base64 encoded.
• Or some other approach!

First mentioned on Zulip: https://chat.fhir.org/#narrow/stream/215610-shorthand/topic/base64.20elements