Services: Renamed from Servers

It didn't feel right to have a "DHCPClient" in a "Servers" directory.
Rename this to Services to better reflect the type of programs we'll
be putting in there.

Services/ProtocolServer/ProtocolServer.ipc

@@ -0,0 +1,15 @@
+endpoint ProtocolServer = 9
+{
+    // Basic protocol
+    Greet() => (i32 client_id)
+
+    // FIXME: It would be nice if the kernel provided a way to avoid this
+    DisownSharedBuffer(i32 shbuf_id) => ()
+
+    // Test if a specific protocol is supported, e.g "http"
+    IsSupportedProtocol(String protocol) => (bool supported)
+
+    // Download API
+    StartDownload(String url) => (i32 download_id)
+    StopDownload(i32 download_id) => (bool success)
+}