Move CaptureNotification into Sounds sub-folder.

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -303,7 +303,6 @@
     <Compile Include="Traits\PowerTooltip.cs" />
     <Compile Include="Traits\VeteranProductionIconOverlay.cs" />
     <Compile Include="Traits\Capturable.cs" />
-    <Compile Include="Traits\CaptureNotification.cs" />
     <Compile Include="Traits\Captures.cs" />
     <Compile Include="Traits\Cargo.cs" />
     <Compile Include="Traits\CashTrickler.cs" />
@@ -476,6 +475,7 @@
     <Compile Include="Traits\Sound\AnnounceOnBuild.cs" />
     <Compile Include="Traits\Sound\AnnounceOnKill.cs" />
     <Compile Include="Traits\Sound\AnnounceOnSeen.cs" />
+    <Compile Include="Traits\Sound\CaptureNotification.cs" />
     <Compile Include="Traits\Sound\DeathSounds.cs" />
     <Compile Include="Traits\Sound\SoundOnDamageTransition.cs" />
     <Compile Include="Traits\SupplyTruck.cs" />