Remove unused Effects.h/.cpp and class Effect

There was an empty vector of effect* in PlayGuiObject.

projects/mtg/template.vcxproj

@@ -493,7 +493,6 @@
     <ClInclude Include="include\DeckView.h" />
     <ClInclude Include="include\DuelLayers.h" />
     <ClInclude Include="include\Easing.h" />
-    <ClInclude Include="include\Effects.h" />
     <ClInclude Include="include\ExtraCost.h" />
     <ClInclude Include="include\GameApp.h" />
     <ClInclude Include="include\GameObserver.h" />
@@ -592,4 +591,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>