FancyZones and Shortcut Guide initial commit

Co-authored-by: Alexis Campailla <alexis@janeasystems.com>
Co-authored-by: Bret Anderson <bretan@microsoft.com>
Co-authored-by: Enrico Giordani <enrico.giordani@gmail.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: Jeff Bogdan <jeffbog@microsoft.com>
Co-authored-by: March Rogers <marchr@microsoft.com>
Co-authored-by: Mike Harsh <mharsh@microsoft.com>
Co-authored-by: Nachum Bundak <Nachum.Bundak@microsoft.com>
Co-authored-by: Oliver Jones <ojones@microsoft.com>
Co-authored-by: Patrick Little <plittle@microsoft.com>

src/runner/powertoys_events.cpp

@@ -0,0 +1,54 @@
+#include "pch.h"
+#include "powertoys_events.h"
+#include "lowlevel_keyboard_event.h"
+#include "win_hook_event.h"
+
+void first_subscribed(const std::wstring& event) {
+  if (event == ll_keyboard)
+    start_lowlevel_keyboard_hook();
+  else if (event == win_hook_event)
+    start_win_hook_event();
+}
+
+void last_unsubscribed(const std::wstring& event) {
+  if (event == ll_keyboard)
+    stop_lowlevel_keyboard_hook();
+  else if (event == win_hook_event)
+    stop_win_hook_event();
+}
+
+PowertoysEvents& powertoys_events() {
+  static PowertoysEvents powertoys_events;
+  return powertoys_events;
+}
+
+void PowertoysEvents::register_receiver(const std::wstring & event, PowertoyModuleIface* module) {
+  std::unique_lock lock(mutex);
+  auto& subscribers = receivers[event];
+  if (subscribers.empty()) {
+    first_subscribed(event);
+  }
+  subscribers.push_back(module);
+}
+
+void PowertoysEvents::unregister_receiver(PowertoyModuleIface* module) {
+  std::unique_lock lock(mutex);
+  for (auto&[event, subscribers] : receivers) {
+    subscribers.erase(remove(begin(subscribers), end(subscribers), module), end(subscribers));
+    if (subscribers.empty()) {
+      last_unsubscribed(event);
+    }
+  }
+}
+
+intptr_t PowertoysEvents::signal_event(const std::wstring & event, intptr_t data) {
+  intptr_t rvalue = 0;
+  std::shared_lock lock(mutex);
+  if (auto it = receivers.find(event); it != end(receivers)) {
+    for (auto& module : it->second) {
+      if (module)
+        rvalue |= module->signal_event(event.c_str(), data);
+    }
+  }
+  return rvalue;
+}