Make Juliet a dynamic library.

Added some dllexport (JULIET_API) to make the code compile.
A lot are missing but will be added when needed

Juliet/include/Graphics/Graphics.h

@@ -1,11 +1,12 @@
 #pragma once
 
 #include <Graphics/GraphicsConfig.h>
+#include <Juliet.h>
 
 // Graphics Interface
 namespace Juliet
 {
     struct GraphicsDevice;
 
-    extern GraphicsDevice* CreateGraphicsDevice(GraphicsConfig config);
+    extern JULIET_API GraphicsDevice* CreateGraphicsDevice(GraphicsConfig config);
 } // namespace Juliet