Update to React 17

[cbeer]

Fixes #3601

[codecov-commenter]

Codecov Report

Merging #3741 (dcbb320) into master (889e087) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #3741   +/-   ##
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  Coverage   92.46%   92.46%           
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  Files         201      201           
  Lines        3463     3463           
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  Hits         3202     3202           
  Misses        261      261           

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[whunter]

@jcoyne @cbeer
Hi, how's it going? I can see that you just merged this stuff yesterday so I apologize for being impatient but I was wondering if you all know when you'll be creating a release that includes these commits?
My boss would very much like us to be on 17 at least. haha. Any info would be appreciated.

[enriquediaz]

Hi @jcoyne I can chime in here to say there is still more work to do before a release from this effort is ready. The goal of the activity you've been observing is to get Mirador to React 18, where 17 is a stepping stone among other aspects. Check out the roadmap document when you have a chance to see the scope of what's going on, and please join us at the next Mirador Community Call this week.