Edited Issue: [UX] Icons on toolbar control of the Mapping Details window look too small on high definition displays [1359]

Mapping Window toolbar icons are not properly sized on high DPI. Also the toolbar control itself doesn't scale automatically.

Split from:

[#1057](https://entityframework.codeplex.com/workitem/1057) Icons on tree grid control of the Mapping Details window look too small on high definition displays