[Fixed Position] Text size control for text and telemetry objects

Add a select control for text and telemetry objects to allow setting text size. Set the default size to 13px.

Fixes # 1496

platform/features/layout/src/FixedController.js

@@ -256,7 +256,8 @@ define(
                     titled: true,
                     width: DEFAULT_DIMENSIONS[0],
                     height: DEFAULT_DIMENSIONS[1],
-                    useGrid: true
+                    useGrid: true,
+                    size: "14px"
                 });
 
                 //Re-initialize objects, and subscribe to new object

platform/features/layout/src/elements/ElementFactory.js

@@ -42,7 +42,8 @@ define(
                 },
                 "fixed.text": {
                     fill: "transparent",
-                    stroke: "transparent"
+                    stroke: "transparent",
+                    size: "14px"
                 }
             },
             DIALOGS = {

platform/features/layout/src/elements/TextProxy.js

@@ -58,6 +58,15 @@ define(
              */
             proxy.text = new AccessorMutator(element, 'text');
 
+            /**
+             * Get and/or set the text size of this element.
+             *
+             * @param {string} [size] the new text size (if setting)
+             * @returns {string} the text size
+             * @memberof platform/features/layout.TextProxy#
+             */
+            proxy.size = new AccessorMutator(element, 'size');
+
             return proxy;
         }