Strong name sign Avalonia.Remote.Protocol.

It needs to be signed to be used in VS.

src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj

@@ -2,6 +2,8 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <DefineConstants>AVALONIA_REMOTE_PROTOCOL;$(DefineConstants)</DefineConstants>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="..\Avalonia.Input\Key.cs" />