add ability to strike/unstrike Field Report report entries

[srabraham]

this lets the user strike/unstrike from both the Incident page and the Field Report page.

This adds a "show history" checkbox to the FR page, as we already had for the Incident page.
This also brings back option+enter for submitting report entries (something very useful on OSX, which I removed recently).

#249

[codecov]

Codecov Report

Attention: Patch coverage is 68.13187% with 29 lines in your changes missing coverage. Please review.

Project coverage is 69.70%. Comparing base (0b7db23) to head (cc7634c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ims/application/_api.py	0.00%	26 Missing ⚠️
src/ims/store/test/report.py	92.30%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1510      +/-   ##
==========================================
- Coverage   69.74%   69.70%   -0.04%     
==========================================
  Files         181      181              
  Lines        9070     9148      +78     
  Branches     1498     1506       +8     
==========================================
+ Hits         6326     6377      +51     
- Misses       2637     2662      +25     
- Partials      107      109       +2     

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[srabraham]

the CodeFactor alert was a complaint about _api.py being too complex, in that it now has 129 code paths. That seems kind of hard to avoid though