Cleanup and improve syntax highlighting

* Static class members are now displayed in Italics and in a darker color, making them easier to distinguish.
* Cleaned up some issues related to syntax highlighting and refactored it into a global class.
* Methods and properties no longer display their arguments as part of the member name, they are only displayed when "Evaluate" is pressed.

src/Tests/TestClass.cs

@@ -22,6 +22,10 @@ namespace Explorer.Tests
             ILHashSetTest.Add("3");
         }
 
+        public static int StaticProperty => 5;
+        public static int StaticField = 5;
+        public int NonStaticField;
+
         // test a non-generic dictionary
 
         public Hashtable TestNonGenericDict()