Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

src/network/socket_handler.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <biboumi.h>
+#include <memory>
+
+class Poller;
+
+using socket_t = int;
+
+class SocketHandler
+{
+public:
+  explicit SocketHandler(std::shared_ptr<Poller>& poller, const socket_t socket):
+    poller(poller),
+    socket(socket)
+  {}
+  virtual ~SocketHandler() = default;
+  SocketHandler(const SocketHandler&) = delete;
+  SocketHandler(SocketHandler&&) = delete;
+  SocketHandler& operator=(const SocketHandler&) = delete;
+  SocketHandler& operator=(SocketHandler&&) = delete;
+
+  virtual void on_recv() {}
+  virtual void on_send() {}
+  virtual void connect() {}
+  virtual bool is_connected() const = 0;
+
+  socket_t get_socket() const
+  { return this->socket; }
+
+protected:
+  /**
+   * A pointer to the poller that manages us, because we need to communicate
+   * with it.
+   */
+  std::shared_ptr<Poller> poller;
+  /**
+   * The handled socket.
+   */
+  socket_t socket;
+};
+