add client disconnect button

include/client/render/gui/GameMenu.h

@@ -18,6 +18,8 @@ private:
 	void ShowPlayers();
 	void ShowLobbyProgress();
 	void ShowTeamSelection();
+
+	void DisconnectButton();
 };
 
 } // namespace gui

src/client/Client.cpp

@@ -37,6 +37,9 @@ void Client::CloseConnection() {
 
 	protocol::DisconnectPacket packet;
 	m_Connexion.SendPacket(&packet);
+
+	m_Game->SetGameState(game::GameState::Disconnected);
+	m_Connexion.CloseConnection();
 }
 
 void Client::Tick(std::uint64_t delta) {

src/client/render/gui/GameMenu.cpp

@@ -24,6 +24,8 @@ void GameMenu::Render() {
 		ShowPlayers();
 		ShowLobbyProgress();
 		ShowTeamSelection();
+		ImGui::Separator();
+		DisconnectButton();
 
 		ImGui::End();
 	}
@@ -33,6 +35,8 @@ void GameMenu::Render() {
 		ShowTPS();
 		ShowStats();
 		ShowPlayers();
+		ImGui::Separator();
+		DisconnectButton();
 
 		ImGui::End();
 
@@ -95,5 +99,11 @@ void GameMenu::ShowStats() {
 	ImGui::Text("EXP: %i", GetClient()->GetGame().GetPlayer()->GetExp());
 }
 
+void GameMenu::DisconnectButton() {
+	if (ImGui::Button("Disconnect")) {
+		m_Client->CloseConnection();
+	}
+}
+
 } // namespace gui
 } // namespace td