Adjust tab styling

- Pass separator bars to tabs, disable drawn borders
- Remove ActionBar from leftnav
- Remove PrintProgressBar from leftnav
- Revise BreadCrumb button attributes
- Revise UpFolder icon
- Revise overflow/pancake menu icon
- Create OverflowButton to encapsulate common menu item
- Use horizontal/VerticalLine for consistent color/weight separators
- Reduce visual clutter
  - Minimize regions created by color and line separators
  - Reduce the contrast of separator lines
  - Reduce the contrast of region backgrounds
  - Use consistent background colors across sibling tab pages

CustomWidgets/AltGroupBox.cs

@@ -29,7 +29,6 @@ either expressed or implied, of the FreeBSD Project.
 
 using MatterHackers.Agg;
 using MatterHackers.Agg.UI;
-using MatterHackers.MatterControl.CustomWidgets;
 
 namespace MatterHackers.MatterControl
 {
@@ -92,7 +91,6 @@ namespace MatterHackers.MatterControl
 			this.Margin = new BorderDouble(0);
 			this.groupBoxLabel = groupBoxLabel;
 			this.HAnchor = Agg.UI.HAnchor.ParentLeftRight;
-			this.BackgroundColor = ActiveTheme.Instance.TertiaryBackgroundColor;
 
 			if (groupBoxLabel != null)
 			{