Remove legacy event system and update to new event dispatcher

- Delete event_system and related demo/test files - Remove common_events
and integration examples - Update CMakeLists.txt to require C++17 -
Update nativeapi.h to use event_dispatcher/event headers - Implement
GetGlobalEventDispatcher in event_dispatcher.cpp/h

Author: lijy91

docs/EVENT_SYSTEM.md

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.10)
 project(display_example VERSION 0.0.1 LANGUAGES CXX)
 
 # Set C++ standard
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # Add example program

examples/display_example/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.10)
 project(window_example VERSION 0.0.1 LANGUAGES CXX)
 
 # Set C++ standard
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # Add example program

examples/window_example/CMakeLists.txt

@@ -4,8 +4,8 @@
 #include "../src/app_runner.h"
 #include "../src/display.h"
 #include "../src/display_manager.h"
-#include "../src/event_system.h"
-#include "../src/common_events.h"
+#include "../src/event.h"
+#include "../src/event_dispatcher.h"
 #include "../src/geometry.h"
 #include "../src/keyboard_monitor.h"
 #include "../src/menu.h"