Move DisplayType out of IEmulator.cs, that's an annoying place for it to be, instead put it in a new file with Enum.cs which has one line which is silly. silly > annoying

BizHawk.Emulation.Common/BizHawk.Emulation.Common.csproj

@@ -58,6 +58,7 @@
     <Compile Include="Database\FirmwareDatabase.cs" />
     <Compile Include="Database\GameInfo.cs" />
     <Compile Include="EmulationExceptions.cs" />
+    <Compile Include="Enums.cs" />
     <Compile Include="Extensions.cs" />
     <Compile Include="Interfaces\CoreComms.cs" />
     <Compile Include="Interfaces\IController.cs" />

BizHawk.Emulation.Common/Enums.cs

@@ -0,0 +1,4 @@
+namespace BizHawk.Emulation.Common
+{
+	public enum DisplayType { NTSC, PAL, DENDY }
+}

BizHawk.Emulation.Common/Interfaces/IEmulator.cs

@@ -77,6 +77,4 @@ namespace BizHawk.Emulation.Common
 		/// </summary>
 		CoreComm CoreComm { get; }
 	}
-
-	public enum DisplayType { NTSC, PAL, DENDY }
 }