WindowServer: Rename WSMessage* => WSEvent*.

Since I'm on a roll here, I'll just rename WSMessageFoo to WSEventFoo now
that these inherit from CEventFoo anyway.

Servers/WindowServer/WSEventLoop.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "WSEvent.h"
+#include <AK/HashMap.h>
+#include <AK/OwnPtr.h>
+#include <AK/Vector.h>
+#include <AK/Function.h>
+#include <AK/WeakPtr.h>
+#include <LibCore/CEventLoop.h>
+
+class CObject;
+struct WSAPI_ClientMessage;
+struct WSAPI_ServerMessage;
+
+class WSEventLoop : public CEventLoop {
+public:
+    WSEventLoop();
+    virtual ~WSEventLoop() override;
+
+    static WSEventLoop& the();
+
+    void on_receive_from_client(int client_id, const WSAPI_ClientMessage&);
+    void notify_client_disconnected(int client_id);
+
+private:
+    virtual void add_file_descriptors_for_select(fd_set&, int& max_fd_added) override;
+    virtual void process_file_descriptors_after_select(const fd_set&) override;
+    virtual void do_processing() override { }
+
+    void drain_server();
+    void drain_mouse();
+    void drain_keyboard();
+
+    int m_keyboard_fd { -1 };
+    int m_mouse_fd { -1 };
+    int m_server_fd { -1 };
+};