Upgrade X2JS from v1.2.0 to v3.4.4

[Raruto]

Checklist

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

Motivation

As per v3.8,

---

It's not so clear what is the currently installed version of x2js, as you can see there are three files uploaded in the src/assets/vendors/x2js folder:

• xml2json.g3w.min.js
• xml2json.js
• xml2json.min.js

---

There also seems to be a bug related to the parsing of queried coordinates (click on the map) on Firefox browsers:

XML Parsing Error: syntax error
Location: http://localhost:8000/en/map/buildings/qdjango/10/
Line Number 1, Column 1:

Related to: #356 (comment) and #356 (comment)

Suggested solution

Since I guess the current installed version could be v1.2.0:

g3w-client/src/assets/vendors/x2js/xml2json.js

Line 30 in 716fdff

var VERSION = "1.2.0";

I hope that updating that dependency to the latest available (ie. v3.4.4) will fix firefox related bug as well:

var VERSION = "3.4.4";

For more info: x2js/x2js

Alternatives considered

Remove this static vendor assets as well and install them via npm? Related to: #290