Extensions (#737)

- add the current document title in the toolbar
- allow user extensions to define optional parameters
- more events for renamedElement, beforeClear, afterClear, sourceChanged
- remove "message" event used for iframe integration not used anymore. can be readded through a new extension if necessary
- default precision down to 2 digits (and applied in rotation)

src/editor/Editor.js

@@ -577,6 +577,36 @@ class Editor extends EditorStartup {
     )
   }
 
+  /**
+   * @returns {void}
+   */
+  elementRenamed (win, renameObj) {
+    this.svgCanvas.runExtensions(
+      'elementRenamed',
+      /** @type {module:svgcanvas.SvgCanvas#event:ext_elementRenamed} */ {
+        renameObj
+      }
+    )
+  }
+
+  /**
+   * @returns {void}
+   */
+  afterClear (win) {
+    this.svgCanvas.runExtensions(
+      'afterClear'
+    )
+  }
+
+  /**
+   * @returns {void}
+   */
+  beforeClear (win) {
+    this.svgCanvas.runExtensions(
+      'beforeClear'
+    )
+  }
+
   /**
    * @returns {void}
    */