Rewrote Gamestate to be a class instead of an interface; Added layers

NothinFancy/NothinFancy.vcxproj

@@ -192,6 +192,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="src\Application.cpp" />
+    <ClCompile Include="src\Gamestate.cpp" />
     <ClCompile Include="src\IntroGamestate.cpp" />
     <ClCompile Include="src\Renderer\Drawable.cpp" />
     <ClCompile Include="src\Renderer\IndexBuffer.cpp" />
@@ -205,7 +206,7 @@
     <ClInclude Include="src\include\Application.h" />
     <ClInclude Include="src\include\Config.h" />
     <ClInclude Include="src\include\Drawable.h" />
-    <ClInclude Include="src\include\IGamestate.h" />
+    <ClInclude Include="src\include\Gamestate.h" />
     <ClInclude Include="src\include\IndexBuffer.h" />
     <ClInclude Include="src\include\IntroGamestate.h" />
     <ClInclude Include="src\include\Input.h" />