Added GeoClue2 privacy item

Rebased onto current master and fixed the privacy module build:
- privacy_item.hpp no longer includes privacy.hpp (it does not use the
  Privacy class); this broke the circular include that left PrivacyItem
  undeclared when privacy.hpp was reached first from privacy_item.cpp.
- privacy_item.cpp now includes gtkmm/label.h explicitly, since Gtk::Label
  was previously only pulled in transitively via privacy.hpp.

include/modules/privacy/privacy.hpp

@@ -1,13 +1,16 @@
 #pragma once
 
+#include <atomic>
 #include <string>
 
 #include "gtkmm/box.h"
 #include "modules/privacy/privacy_item.hpp"
+#include "util/geoclue_backend.hpp"
 #include "util/pipewire/pipewire_backend.hpp"
 #include "util/pipewire/privacy_node_info.hpp"
 
-using waybar::util::PipewireBackend::PrivacyNodeInfo;
+using waybar::util::PipewireBackend::PrivacyNodeType;
+using waybar::util::PipewireBackend::PWPrivacyNodeInfo;
 
 namespace waybar::modules::privacy {
 
@@ -16,15 +19,15 @@ class Privacy : public AModule {
   Privacy(const std::string&, const Json::Value&, Gtk::Orientation, const std::string& pos);
   auto update() -> void override;
 
-  void onPrivacyNodesChanged();
-
  private:
-  std::list<PrivacyNodeInfo*> nodes_screenshare;  // Screen is being shared
-  std::list<PrivacyNodeInfo*> nodes_audio_in;     // Application is using the microphone
-  std::list<PrivacyNodeInfo*> nodes_audio_out;    // Application is outputting audio
+  std::list<PWPrivacyNodeInfo*> nodes_screenshare;  // Screen is being shared
+  std::list<PWPrivacyNodeInfo*> nodes_audio_in;     // Application is using the microphone
+  std::list<PWPrivacyNodeInfo*> nodes_audio_out;    // Application is outputting audio
+  std::atomic<bool> location_in_use;                // GeoClue is being used
 
   std::mutex mutex_;
   sigc::connection visibility_conn;
+  sigc::connection geoclue_timeout_conn;
 
   // Config
   Gtk::Box box_;
@@ -35,7 +38,12 @@ class Privacy : public AModule {
   std::set<std::pair<PrivacyNodeType, std::string>> ignore;
   bool ignore_monitor = true;
 
-  std::shared_ptr<util::PipewireBackend::PipewireBackend> backend = nullptr;
+  std::shared_ptr<util::PipewireBackend::PipewireBackend> pw_backend = nullptr;
+  std::shared_ptr<util::GeoClueBackend::GeoClueBackend> geoclue_backend = nullptr;
+
+  void onPWPrivacyNodesChanged();
+  bool locationTimeout(bool in_use);
+  void onGeoCluePrivacyNodesChanged();
 };
 
 }  // namespace waybar::modules::privacy