Replace prototype javascript code with Class declaration

[volterra79]

Checklist

• I've searched through the current issues to make sure this feature hasn't been requested already.

Motivation

To have a clean code it is better to use javascript Class declaration

Suggested solution

For example:

• Current code

const {base, inherit}= require('core/utils/utils');
const G3WObject = require('core/g3wobject');

function ProjectsRegistry() {
  ....
}
inherit(ProjectsRegistry, G3WObject);

const proto = ProjectsRegistry.prototype;
proto.clear = function(){
 .....
}

• New code

const G3WObject = require('core/g3wobject');

class ProjectsRegistry extends G3WObject {
   constructor(){
     super();
     ......
   }
   clear(){
      ....
    }

Alternatives considered

No response

[Raruto]

#574 took care of this.

Little by little other classes will also migrate.