[Frontend] Tweaks and minor mods

WTD-894
Changed image CSS from contain to cover
Modded default colors for text and telemetry elements to visibility;
Moved click handler position in menu-button.html for better clickability;

Conflicts:
	platform/commonUI/general/res/css/theme-espresso.css

platform/features/layout/src/FixedController.js

@@ -235,7 +235,7 @@ define(
                     y: Math.floor(position.y / gridSize[1]),
                     id: id,
                     stroke: "transparent",
-                    color: "#717171",
+                    color: "#cccccc",
                     titled: true,
                     width: DEFAULT_DIMENSIONS[0],
                     height: DEFAULT_DIMENSIONS[1]

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

@@ -24,7 +24,7 @@ define(
                 "fixed.text": {
                     fill: "transparent",
                     stroke: "transparent",
-                    color: "#717171"
+                    color: "#cccccc"
                 }
             },
             DIALOGS = {