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/modules/shortcut_guide/target_state.h

@@ -0,0 +1,35 @@
+#pragma once
+#include <deque>
+#include <thread>
+#include <mutex>
+#include <condition_variable>
+#include <chrono>
+#include "shortcut_guide.h"
+
+struct KeyEvent {
+  bool key_down;
+  unsigned vk_code;
+};
+
+class TargetState {
+public:
+  TargetState(int ms_delay);
+  bool signal_event(unsigned vk_code, bool key_down);
+  void was_hiden();
+  void exit();
+  void set_delay(int ms_delay);
+private:
+  KeyEvent next();
+  void handle_hidden();
+  void handle_timeout();
+  void handle_shown();
+  void thread_proc();
+  std::mutex mutex;
+  std::condition_variable cv;
+  std::chrono::system_clock::time_point winkey_timestamp, singnal_timestamp;
+  std::chrono::milliseconds delay;
+  std::deque<KeyEvent> events;
+  enum { Hidden, Timeout, Shown, Exiting } state = Hidden;
+  bool key_was_pressed = false;
+  std::thread thread;
+};