Mirador4 compat

[cbeer]

No description provided.

[geourjoa]

Hi Chris,

I will follow your work with interest even if the PR is in draft mode.

I was not able to run it in dev mode out of the box. I have run these two commands :

npm install --save-dev @babel/plugin-proposal-private-methods
npm install --save-dev babel-plugin-transform-react-remove-prop-types

Now I have a Mirador instance up with your plugin.

I have try to use the image tools but nothing is displayed when I click show Image Tools.

[cbeer]

Replaced by #49