Refactor SharpGen.Runtime to not use the Sdk since it doesn't need it.

Author: jkoritzinsky

Mapping.xml

@@ -23,7 +23,6 @@
 <config id="sharpgen-runtime-com" xmlns="urn:SharpGen.Config">
   <namespace>SharpGen.Runtime</namespace>
   <assembly>SharpGen.Runtime.COM</assembly>
-  <depends>SharpGen.Runtime</depends>
 
 
   <sdk name="WindowsSdk" version="10.0.15063.0" />
@@ -132,9 +131,6 @@
     <bind from="DISPPARAMS" to="System.Runtime.InteropServices.ComTypes.DISPPARAMS"/>
     <bind from="EXCEPINFO" to="System.Runtime.InteropServices.ComTypes.EXCEPINFO"/>
 
-    <!-- Root IUnknown interface -->
-
-
     <!-- COM interfaces not directly used -->
     <bind from="ITypeInfo" to="SharpGen.Runtime.ComObject" />
     <bind from="IErrorLog" to="SharpGen.Runtime.ComObject" />

SharpGen.Runtime.COM.csproj

@@ -8,7 +8,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <ProjectReference Include="../SharpGen.Runtime/SharpGen.Runtime.csproj" />
     <SharpGenMapping Include="Mapping.xml" />
     <PackageReference Include="System.Memory" Version="4.4.0-preview2-25405-01" />
     <PackageReference Include="SharpGen.Doc.Msdn.Tasks" Version="$(LocalPackageVersion)">