Allow to use online RCanvas without openui5

It is already implemented with TWebCanvas, just copy and paste
few lines

Author: linev

scripts/JSRoot.core.js

@@ -105,7 +105,7 @@
 
    /** @summary JSROOT version date
      * @desc Release date in format day/month/year like "6/01/2021"*/
-   JSROOT.version_date = "11/01/2021";
+   JSROOT.version_date = "13/01/2021";
 
    /** @summary JSROOT version id and date
      * @desc Produced by concatenation of {@link JSROOT.version_id} and {@link JSROOT.version_date}

scripts/JSRoot.v7gpad.js

@@ -3248,6 +3248,16 @@ JSROOT.define(['d3', 'painter'], (d3, jsrp) => {
          if (this.batch_mode && this.iscan)
              this._fixed_size = true;
 
+         if (JSROOT.BrowserLayout && !this.batch_mode && !this.use_openui && !this.brlayout) {
+            let mainid = this.selectDom().attr("id");
+            if (mainid && (typeof mainid == "string")) {
+               this.brlayout = new JSROOT.BrowserLayout(mainid, null, this);
+               this.brlayout.create(mainid, true);
+               this.setDom(this.brlayout.drawing_divid()); // need to create canvas
+               jsrp.registerForResize(this.brlayout);
+            }
+         }
+
          this.createCanvasSvg(0);
          this.addPadButtons(true);