refactor: Don't initialize forward declared members

Using brace initialization here causes bar.hpp to not compile when
included on its own, forcing all clients to also include
tray_manager.hpp and so on, which defeats the purpose of forward
declaring those classes.

This also allows us to remove the tray_manager.hpp, renderer.hpp and
parser.hpp includes from the clients of bar.hpp

include/components/bar.hpp

@@ -97,9 +97,9 @@ class bar : public xpp::event::sink<evt::button_press, evt::expose, evt::propert
   const config& m_conf;
   const logger& m_log;
   unique_ptr<screen> m_screen;
-  unique_ptr<tray_manager> m_tray{};
-  unique_ptr<renderer> m_renderer{};
-  unique_ptr<parser> m_parser{};
+  unique_ptr<tray_manager> m_tray;
+  unique_ptr<renderer> m_renderer;
+  unique_ptr<parser> m_parser;
   unique_ptr<taskqueue> m_taskqueue;
 
   bar_settings m_opts{};

src/components/controller.cpp

@@ -5,7 +5,6 @@
 #include "components/controller.hpp"
 #include "components/ipc.hpp"
 #include "components/logger.hpp"
-#include "components/renderer.hpp"
 #include "components/types.hpp"
 #include "events/signal.hpp"
 #include "events/signal_emitter.hpp"
@@ -18,7 +17,6 @@
 #include "utils/time.hpp"
 #include "x11/connection.hpp"
 #include "x11/extensions/all.hpp"
-#include "x11/tray_manager.hpp"
 #include "x11/types.hpp"
 
 POLYBAR_NS

src/main.cpp

@@ -3,12 +3,9 @@
 #include "components/config.hpp"
 #include "components/controller.hpp"
 #include "components/ipc.hpp"
-#include "components/parser.hpp"
-#include "components/renderer.hpp"
 #include "utils/env.hpp"
 #include "utils/inotify.hpp"
 #include "utils/process.hpp"
-#include "x11/tray_manager.hpp"
 
 using namespace polybar;