Move App and AppMenu back into Core

Author: Vogel612

Rubberduck.Main/App.cs renamed to Rubberduck.Core/App.cs

@@ -311,6 +311,8 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="App.cs" />
+    <Compile Include="AppMenu.cs" />
     <Compile Include="Common\ApplicationConstants.cs" />
     <Compile Include="Common\ExportFormatter.cs" />
     <Compile Include="Common\ClipboardWriter.cs" />

Rubberduck.Main/AppMenu.cs renamed to Rubberduck.Core/AppMenu.cs

@@ -233,8 +233,6 @@
     <OutputType>Library</OutputType>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="App.cs" />
-    <Compile Include="AppMenu.cs" />
     <Compile Include="ComInteraction\UI\DockableWindowHost.cs" />
     <Compile Include="ComInteraction\UnitTesting\AssertClass.cs" />
     <Compile Include="ComInteraction\UnitTesting\FakesProvider.cs" />