feat: replace global with globalThis

[rtritto]

globalThis references with compatibilities:

• https://v8.dev/features/globalthis
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis

It's introduced from Node 12 (this plugin is Node >= 14) and it's the unified way to access the "global" object.

This has the benefit of making code more cross-platform and more consistent.

Old

• window.foo; // Browser
• self.foo; // Web Worker
• global.foo; // Node.js

New

• globalThis.foo;

---

Currently globalThis need to be pollyfilled in Karma context (tests fails).
I did these tries but didn't work:

1. test directory

   // /test/polyfill-globalthis.js
   (function() {
     if (typeof globalThis === 'undefined') {
       globalThis = (function() {
         if (typeof self !== 'undefined') { return self; }
         if (typeof window !== 'undefined') { return window; }
         if (typeof global !== 'undefined') { return global; }
         throw new Error('Unable to locate global object');
       })();
     }
   })();

   // /test/karma.config.js
       files: [
   +     'test/polyfill-globalthis.js',
         'node_modules/video.js/dist/video-js.css',
         'dist/videojs-mobile-ui.css',
   
         'node_modules/sinon/pkg/sinon.js',
         'node_modules/video.js/dist/video.js',
         'test/dist/bundle.js'
       ],

2. scripts directory

   // /scripts/polyfill-globalthis.js
   (function() {
     if (typeof globalThis === 'undefined') {
       globalThis = (function() {
         if (typeof self !== 'undefined') { return self; }
         if (typeof window !== 'undefined') { return window; }
         if (typeof global !== 'undefined') { return global; }
         throw new Error('Unable to locate global object');
       })();
     }
   })();

   // /scripts/karma.config.js
   -  const options = {};
   +  const options = {
   +    files: [
   +      'scripts/polyfill-globalthis.js',
   +      'node_modules/video.js/dist/video-js.css',
   +      'dist/*.css',
   +      'node_modules/sinon/pkg/sinon.js',
   +      'node_modules/video.js/dist/video.js',
   +      'test/dist/bundle.js'
   +    ]
   +  };

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