Fixes All Warnings (#450)

* Revert "Drop NuGet restore"

This reverts commit 5c7a0d05f077755943ec66e6a82db890a24cd056.

* Revert "Revert "Drop NuGet restore""

This reverts commit 2dc5fce8654ffeb6f3e570b0bdefcc6a5b6a6d2b.

* terminal.sln

* there. That wasn't so hard

* fixed some cases where <inheritdoc/> should have been used

* fixed some cases where <inheritdoc/> should have been used

Terminal.Gui/Views/TextView.cs

@@ -283,7 +283,7 @@ namespace Terminal.Gui {
 		//bool used;
 
 		/// <summary>
-		/// Event invoked when text was changed.
+		/// Raised when the Text of the TextView changes.
 		/// </summary>
 		public event EventHandler TextChanged;