remove jquery dependency

[marfyl]

• remove jquery dependency on javascript code
• remove all references in the readme file and demo htmls
• code formatter
  • tabWidth: 4
  • singleQuote: true

Each file was formatted in a different way and cytoscape-node-editing.js file use several criterias at the same time, so I use the criteria shown above, since it were the most used inside the file. (If you want another criteria I can change it)

I think that in the future it would be good to add a .editorconfig file or .prettierrc.js file to maintain consistent coding styles for multiple developers working on the same project across various editors and IDEs. (I could add one if you want)

I hope this PR will help, anything let me know.

[hasanbalci]

@marfyl Thanks for the PR. I checked some other extensions we developed and it seems that we generally prefer tabWidth: 2. Can you also change it for this PR as tabWidth: 2?

[marfyl]

done! I just pushed the changes, thanks for the review.

[hasanbalci]

@marfyl Thanks for the changes. I reviewed the PR and it seems generally ok, but I noticed a bug in your version that doesn't exist in our version. You can see that in the below video I generated using undoable demo. Can you please check the cause of the problem?

node-editing-bug.mp4

[marfyl]

fixed, please refresh the cache to avoid problems

[marfyl]

Do you need anything else from my side to bring out a new product release? Anything else you need just let me know

[hasanbalci]

@marfyl Sorry for the late response. Your last commit fixed the error that I mentioned, but I now realized another bug during undo-redo operation. It is as follows:
Correct behavior in master branch (when I undo, nodes return to their original position):

master_branch.mp4

Behaviour in PR (nodes don't return to their original positions):

PR_branch.mp4