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

ApplicationView/TouchscreenTabView.cs

@@ -63,7 +63,7 @@ namespace MatterHackers.MatterControl
 			: base(Orientation.Vertical)
 		{
 			this.TabBar.BackgroundColor = ActiveTheme.Instance.PrimaryBackgroundColor;
-			this.TabBar.BorderColor = new RGBA_Bytes(0, 0, 0, 0);
+			this.TabBar.BorderColor = RGBA_Bytes.Transparent;
 			this.TabBar.Margin = new BorderDouble(4, 0, 0, 0);
 			this.TabBar.Padding = new BorderDouble(0, 8);
 			this.Margin = new BorderDouble(top: 0);