Move WiiUtils to Core

Allows reusing the WAD import logic more easily, whereas UICommon
code can only be used from UICommon and UI.

And managing what's on the NAND is the Core's responsability, not UI.

Source/Core/UICommon/UICommon.vcxproj

@@ -50,14 +50,12 @@
     <ClCompile Include="USBUtils.cpp">
       <DisableSpecificWarnings>4200;%(DisableSpecificWarnings)</DisableSpecificWarnings>
     </ClCompile>
-    <ClCompile Include="WiiUtils.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="CommandLineParse.h" />
     <ClInclude Include="UICommon.h" />
     <ClInclude Include="Disassembler.h" />
     <ClInclude Include="USBUtils.h" />
-    <ClInclude Include="WiiUtils.h" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(ExternalsDir)cpp-optparse\cpp-optparse.vcxproj">
@@ -67,4 +65,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>