Remove RPC from main distribution (#925)

experiment/Discord.Net.Rpc/Entities/RpcEntity.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Discord.Rpc
+{
+    public abstract class RpcEntity<T> : IEntity<T>
+        where T : IEquatable<T>
+    {
+        internal DiscordRpcClient Discord { get; }
+        public T Id { get; }
+
+        internal RpcEntity(DiscordRpcClient discord, T id)
+        {
+            Discord = discord;
+            Id = id;
+        }
+    }
+}