update react to 17.0.0 and prepare for CRAN

[timelyportfolio]

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[timelyportfolio]

@stla@DivadNojnarg@swsoyee@glin I would really appreciate if you have some time to test this newest version before I submit to CRAN. All JS and R tests pass, but now that this is a package with reverse dependencies and modest popularity I feel a greater responsibility to make sure nothing breaks. The primary changes are with widget to comply with new htmlwidgets convention #49, template clean up #45, webpack + style/css-loader #50, and React -> 17.0.0.

[glin]

@timelyportfolio This works fine with reactable, thanks for the heads up.

[stla]

Hi @timelyportfolio

I have tested the shinyInput with this new version, it works fine.

[timelyportfolio]

thanks @stla. Hope to work on a new update over the next couple of weeks.