Test useRef branch on react-cytoscape-js

[xhluca]

This PR should be tested before merging in react-cytoscapejs: https://github.com/plotly/react-cytoscapejs/pull/53

Also add the following:

• https://github.com/plotly/react-cytoscapejs/pull/72
• https://github.com/plotly/react-cytoscapejs/pull/70
• https://github.com/plotly/react-cytoscapejs/pull/67
• https://github.com/plotly/react-cytoscapejs/pull/59
• https://github.com/plotly/react-cytoscapejs/pull/54
• https://github.com/plotly/react-cytoscapejs/pull/50
• https://github.com/plotly/react-cytoscapejs/pull/40

[kinimesi]

Tested and merged, closing.