Create Custom Workflow to help users initialize the app

[jwildfire]

Current planning to require users to load files when app is initialized in v2.0: safetyGraphicsApp(data=list(aes=myaedata, labs=mylabdata), meta=meta)

Can consider adding in an upload button and the ability to manually select data domains in a later release.

[jwildfire]

Expanding the scope for this issue to include a more robust workflow that helps users:

• load data
• customize metadata
• select charts

Will tackle this after the v2.0 release.

[jwildfire]

As noted here, I think the plan is to create a separate helper application that lets non-techincal users initialize the app via a GUI.

Adding a bit of background, in v1 the labs data was treated as reactive and could be changed while using the app (via the upload button). I've moved away from this approach, and am currently using non-reactive data objects in V2 for 2 main reasons:

• The workflow for the upload section will be significantly more complex with multiple data domains, and would require significant UI design and error checking.
• I don't think it is all that common for users to explore multiple studies in the same instance of the shiny app

[jwildfire]

Closing. Initial implementation complete in #564 - additional issues can be filed for improvements and bug fixes.