Drag n drop sorting for custom fields (#906)

* Try to fix some security vulnerabilities present in used packages

(Ran npm audit fix, solved some of the issues)

* Implement custom field ordering with new handle placement

(WIP, as an update for the jslib is needed to work correctly)

* Update reference for jslib

* Restore original state of package-lock.json

* Downgrade node sass package

package-lock.json

@@ -413,6 +413,15 @@
         "tslib": "^1.9.0"
       }
     },
+    "@angular/cdk": {
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/@angular/cdk/-/cdk-7.2.1.tgz",
+      "integrity": "sha512-oU1Pjq3JkDtkXquLxWK84A2jOCeYRf352dVGbQCxWoSOQ5KBtMAd42huGidPiOSHN6/f7xZwL3n4fq3fVIut8A==",
+      "requires": {
+        "parse5": "^5.0.0",
+        "tslib": "^1.7.1"
+      }
+    },
     "@angular/common": {
       "version": "7.2.1",
       "resolved": "https://registry.npmjs.org/@angular/common/-/common-7.2.1.tgz",
@@ -9648,6 +9657,12 @@
       "integrity": "sha1-bVuTSkVpk7I9N/QKOC1vFmao5cY=",
       "dev": true
     },
+    "parse5": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-5.1.0.tgz",
+      "integrity": "sha512-fxNG2sQjHvlVAYmzBZS9YlDp6PTSSDwa98vkD4QgVDDCAo84z5X1t5XyJQ62ImdLXx5NdIIfihey6xpum9/gRQ==",
+      "optional": true
+    },
     "parseqs": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/parseqs/-/parseqs-0.0.5.tgz",