select which kinds of annotations to pack/unpack

[erickmartins]

pack/unpack should allow users to exclude/include specific kinds of annotations (ROIs, comments, mapannotations, etc)

[joshmoore]

@erickmartins: I'd be interested in the addition of ROI and Shape annotations. Is this something you've looked into already and/or would it be a good starter task for someone?

[erickmartins]

I have not started any work on this - it feels like a relatively straightforward starter task!

[jmuhlich]

I implemented Shape annotations in my local-changes branch, but first I'll need to peel off a series of other PRs to lay the groundwork for this one.