GitLab CI - ESLint - camel case variables

This issue reducces the total number of eslint problems from 261 to 134:

134 problems (95 errors, 39 warnings)

This only deals with camel case issues in the JS files, which should make it easy to review.

It does include some minor indentation problems in YML files, which are also reported by eslint. I felt these were minor enough, and in separate files from the camel case problems, so could be included in the same issue.

Setting to needs review.

Additional issues will be created for further eslint problems.

Thanks for your work on this @lostcarpark. I have manually tested various Javascript-driven behaviour after applying these changes, and everything seems to work as before. Merged in.

Actually I misrepresented the number of errors. Eslint runs twice with different parameters, and the first run returns the bigger number of errors.

Before this change, the number of errors was:

555 problems (512 errors, 43 warnings)

After, its:

385 problems (342 errors, 43 warnings)

So a solid step in the right direction, but quite a lot to do!

Automatically closed - issue fixed for 2 weeks with no activity.