Implement set_maximized, get_current_monitor, set_fullscreen and set_decorations for MacOS (#465)

* Added helper function for make monitor from display.

* Implement get_current_monitor  for macos

* Implemented with_fullscreen and set_fullscreen for macos

* Implemented set_decorations for macos

* Implement set_maximized and with_maximized for macos

* Changed fullscreen example fullscreen keypress from F11 to F

* Update CHANGELOG.md

* Add and fixed some comments

* Reformat and add more comments

* Better handling window and maximized state

* Reformat and typo fix

src/platform/macos/monitor.rs

@@ -6,7 +6,7 @@ use std::collections::VecDeque;
 use super::EventsLoop;
 use super::window::IdRef;
 
-#[derive(Clone)]
+#[derive(Clone, PartialEq)]
 pub struct MonitorId(CGDirectDisplayID);
 
 impl EventsLoop {
@@ -25,6 +25,11 @@ impl EventsLoop {
         let id = MonitorId(CGDisplay::main().id);
         id
     }
+
+    pub fn make_monitor_from_display(id: CGDirectDisplayID) -> MonitorId {
+        let id = MonitorId(id);
+        id
+    }
 }
 
 impl MonitorId {