Theme aware plugin (#4499)

* Migrate theme manager to infrastructure and added it as input to public API instance

* Working event-delegate for PublicAPIInstance

* Theme aware UWP applications

* Theme aware program plugin

* Update query icon on theme change

* Theme aware calculator plugin

* Fix issue with query running before theme change

* Theme based changes in ImageLoader

* Removed ErrorIcon direct references and added references from ImageLoader

* Nit fixes

* Removed unnecessary TODO in UWP.cs

* Added preference to theme based icons

* Added IDisposable interfaces to unsubscribe events

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/Microsoft.Plugin.Calculator.csproj

@@ -49,7 +49,7 @@
   </ItemGroup>
   
   <ItemGroup>
-    <None Include="Images\calculator.png">
+    <None Include="Images\calculator_light.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
@@ -107,5 +107,11 @@
     <PackageReference Include="Mages" Version="1.6.0" />
     <PackageReference Include="System.Runtime" Version="4.3.1" />
   </ItemGroup>
+  
+  <ItemGroup>
+    <None Update="Images\calculator_dark.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
 
 </Project>