Added window control grabbing and special hit testing.

Also cleaned up and added exceptions to better structure exception handling.

Many small changes to improve useability of framework.

Some refactoring.

src/SlatedGameToolkit.Framework/Exceptions/FrameworkException.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace SlatedGameToolkit.Framework.Exceptions
+{
+    public abstract class FrameworkException : Exception {
+        public FrameworkException() {
+
+        }
+
+        public FrameworkException(string message) : base(message) {
+
+        }
+        
+        public FrameworkException(string message, Exception inner) : base(message, inner) {
+        }
+    }
+}

src/SlatedGameToolkit.Framework/Exceptions/FrameworkSDLException.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace SlatedGameToolkit.Framework.Exceptions
+{
+    /// <summary>
+    /// Any errors generated by an SDL feature that the engine requires are wrapped in the form of this type of exception.
+    /// </summary>
+    public class FrameworkSDLException : SDLException {
+        
+        public FrameworkSDLException() : base() {
+
+        }
+
+        public FrameworkSDLException(string message) : base(message) {
+
+        }
+        
+        public FrameworkSDLException(string message, Exception inner) : base(message, inner) {
+        }
+    }
+}

src/SlatedGameToolkit.Framework/Exceptions/FrameworkUsageException.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace SlatedGameToolkit.Framework.Exceptions
+{
+    /// <summary>
+    /// An exception that is thrown when there is an inappropriate use of the framework.
+    /// </summary>
+    public class FrameworkUsageException : FrameworkException {
+        public FrameworkUsageException() : base() {
+
+        }
+
+        public FrameworkUsageException(string message) : base(message) {
+
+        }
+        
+        public FrameworkUsageException(string message, Exception inner) : base(message, inner) {
+        }
+    }
+}

src/SlatedGameToolkit.Framework/Exceptions/InternalFrameworkException.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace SlatedGameToolkit.Framework.Exceptions
+{
+    internal class InternalFrameworkException : FrameworkException {
+        const string ADDITIONAL_MESSAGE = "\nThis exception is a framework bug!";
+        public InternalFrameworkException() : base() {
+
+        }
+
+        public InternalFrameworkException(string message) : base(message + ADDITIONAL_MESSAGE) {
+
+        }
+        
+        public InternalFrameworkException(string message, Exception inner) : base(message + ADDITIONAL_MESSAGE, inner) {
+        }
+    }
+}

src/SlatedGameToolkit.Framework/Exceptions/OptionalSDLException.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace SlatedGameToolkit.Framework.Exceptions
+{
+    /// <summary>
+    /// This exception is produced when the error producing SDL feature is not something the framework considers critical.
+    /// This can happen if not all framework supported platforms support a specific feature that SDL provides.
+    /// </summary>
+    public class OptionalSDLException : SDLException {
+        
+        public OptionalSDLException() : base() {
+
+        }
+
+        public OptionalSDLException(string message) : base(message) {
+
+        }
+        
+        public OptionalSDLException(string message, Exception inner) : base(message, inner) {
+        }
+    }
+}

src/SlatedGameToolkit.Framework/Exceptions/SDLException.cs

@@ -7,7 +7,7 @@ namespace SlatedGameToolkit.Framework.Exceptions
     /// An SDLException is defined as an exception that is thrown whenever an error occurrs in any SDL functions.
     /// </summary>
     [Serializable]
-    public class SDLException : Exception {
+    public abstract class SDLException : Exception {
         public string SDLMessage { get; }
 
         /// <summary>

src/SlatedGameToolkit.Framework/Exceptions/SlatedGameToolkitException.cs

@@ -1,17 +0,0 @@
-using System;
-
-namespace SlatedGameToolkit.Framework.Exceptions
-{
-    public class SlatedGameToolkitException : Exception {
-        public SlatedGameToolkitException() {
-
-        }
-
-        public SlatedGameToolkitException(string message) : base(message) {
-
-        }
-        
-        public SlatedGameToolkitException(string message, Exception inner) : base(message, inner) {
-        }
-    }
-}