More styling improvements for Base Style

- Better scalability
- Retina support
- Added glow filter to Private
- Added focus rects

Change-Id: I2ec36a9db546c21e20408429c5e17fde8d67b7c3
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Expose ToolBarStyle and StatusBarStyle

As they are rather basic, I think we should simply expose them rather
than explain why people should use rectangles.

Change-Id: I8ef79452fb27ffa0ef11bb477c687033996b4a5e
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>