Clean up project structure in Visual Studio (#8)

A few small changes to improve the view of the code in Solution Explorer:
* Delete folders from solution explorer which don't appear on disk (Resource Files, PerfTrack)
* Delete files on disk which aren't compiled into the project (Type.xaml)
* Rename CalculatorHistory.Cpp to CalculatorHistory.cpp, for consistency with other files

src/CalcManager/CalcManager.vcxproj

@@ -288,7 +288,7 @@
     <ClInclude Include="UnitConverter.h" />
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="CalculatorHistory.Cpp" />
+    <ClCompile Include="CalculatorHistory.cpp" />
     <ClCompile Include="CalculatorManager.cpp" />
     <ClCompile Include="CEngine\calc.cpp" />
     <ClCompile Include="CEngine\CalcUtils.cpp" />

src/CalcManager/CalcManager.vcxproj.filters

@@ -1,10 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <Filter Include="Resource Files">
-      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
-      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tga;tiff;tif;png;wav;mfcribbon-ms</Extensions>
-    </Filter>
     <Filter Include="CEngine">
       <UniqueIdentifier>{957a8e3c-00c7-48bc-b63c-83b2140a8251}</UniqueIdentifier>
     </Filter>
@@ -81,7 +77,7 @@
     <ClCompile Include="Ratpack\transh.cpp">
       <Filter>RatPack</Filter>
     </ClCompile>
-    <ClCompile Include="CalculatorHistory.Cpp" />
+    <ClCompile Include="CalculatorHistory.cpp" />
     <ClCompile Include="CalculatorManager.cpp" />
     <ClCompile Include="UnitConverter.cpp" />
     <ClCompile Include="CEngine\CalcInput.cpp">