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/Core/Application/ApplicationManager.h

@@ -5,5 +5,6 @@
 namespace Juliet
 {
     enum class JulietInit_Flags : uint8;
-    void StartApplication(IApplication& app, JulietInit_Flags flags);
+
+    extern JULIET_API void StartApplication(IApplication& app, JulietInit_Flags flags);
 } // namespace Juliet