[INTERNAL] tnt.ToolHeader: activate semantic rendering
[INTERNAL] tnt.ToolHeader: activate semantic rendering

In order to use the DOM patcher (aka "Semantic Rendering"), a renderer
must set the apiVersion=2 as "own" property, the property cannot be
inherited. This mechanism allows that controls in an inheritance chain
can be migrated step by step (from ancestor to descendant).

Change-Id: Ib3f533c975f080d6d1c8c461147c2abaaec3f4bf

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5