Fixes #2469 - Revamp file structure and namespace (#2471)

* initial commit

* All tests pass

* Updated readme

* Revert "All tests pass"

This reverts commit 94ac462350.

* Revert "initial commit"

This reverts commit 36d92cc4e5.

* Moved Terminal.Gui files around

* Nuked .Graphs namespace

* Nuked .Graphs namespace

* Nuked .Trees namespace

* Nuked .Configuration namespace

* Nuked .Configuration namespace

* All tests pass

* tweaked tests

* removed unneeded usings

* re-enabled scrollview tests

* move scrollview test to ScrollViewTests

* Moved view navigation related tests to separate cs file

* Moved view scrollbarview related tests ScrollBarTestse

* Refactored View tests into smaller files

* Refactored driver tests

* Fixed a ton of BUGBUGs

Terminal.Gui/Input/MouseFlagsChangedEventArgs.cs

@@ -0,0 +1,30 @@
+using System;
+
+namespace Terminal.Gui {
+	/// <summary>
+	/// Args for events that describe a change in <see cref="MouseFlags"/>
+	/// </summary>
+	public class MouseFlagsChangedEventArgs : EventArgs {
+
+		/// <summary>
+		/// Creates a new instance of the <see cref="MouseFlagsChangedEventArgs"/> class.
+		/// </summary>
+		/// <param name="oldValue"></param>
+		/// <param name="newValue"></param>
+		public MouseFlagsChangedEventArgs (MouseFlags oldValue, MouseFlags newValue)
+		{
+			OldValue = oldValue;
+			NewValue = newValue;
+		}
+
+		/// <summary>
+		/// The old value before event
+		/// </summary>
+		public MouseFlags OldValue { get; }
+
+		/// <summary>
+		/// The new value
+		/// </summary>
+		public MouseFlags NewValue { get; }
+	}
+}