Full- chain testing with headless chrome browser

[DuesselbergAdrian]

DO NOT MERGE!!! This PR adds testing of new SVGs on Mac. It includes:

• Reference files for new SVGs
• A new function test_new_svg() to create svgs from reference json files and then compare them.
• A manual script how create new reference files

[linev]

@DuesselbergAdrian

I am very close to make testing of JSROOT ready with headless browsers.
It looks promising - for the moment I just cleanup JSROOT code that produced SVG/PNG/JSON files match on browser and with node.js.

Here my working macro:

https://github.com/linev/jsroot-test/blob/puppeteer/puppeteer.js

Probably then one can do very similar with ROOT http server.

[DuesselbergAdrian]

Ok I opened a new PR: #1179
Since I don't have much time left, I will run the test on all platforms and exclude all tests which are failing.