Properly implement Debug for Window and EventLoop types (#3297)

For EventLoop, EventLoopBuilder, EventLoopProxy and by requiring it as
a supertrait of Window and ActiveEventLoop.

It is especially useful for user to be able to know that Window is Debug.

src/platform_impl/orbital/event_loop.rs

@@ -165,7 +165,7 @@ bitflags! {
     }
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 struct EventState {
     keyboard: KeyboardModifierState,
     mouse: MouseButtonState,
@@ -274,6 +274,7 @@ impl EventState {
     }
 }
 
+#[derive(Debug)]
 pub struct EventLoop {
     windows: Vec<(Arc<RedoxSocket>, EventState)>,
     window_target: ActiveEventLoop,
@@ -661,6 +662,7 @@ impl EventLoop {
     }
 }
 
+#[derive(Debug)]
 pub struct EventLoopProxy {
     user_events_sender: mpsc::SyncSender<()>,
     pub(super) wake_socket: TimeSocket,
@@ -678,6 +680,7 @@ impl EventLoopProxyProvider for EventLoopProxy {
 
 impl Unpin for EventLoopProxy {}
 
+#[derive(Debug)]
 pub struct ActiveEventLoop {
     control_flow: Cell<ControlFlow>,
     exit: Cell<bool>,

src/platform_impl/orbital/mod.rs

@@ -15,6 +15,7 @@ pub(crate) use crate::cursor::{
 };
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 
+#[derive(Debug)]
 struct RedoxSocket {
     fd: usize,
 }
@@ -67,6 +68,7 @@ impl Drop for RedoxSocket {
     }
 }
 
+#[derive(Debug)]
 pub struct TimeSocket(RedoxSocket);
 
 impl TimeSocket {

src/platform_impl/orbital/window.rs

@@ -20,6 +20,7 @@ const ORBITAL_FLAG_MAXIMIZED: char = 'm';
 const ORBITAL_FLAG_RESIZABLE: char = 'r';
 const ORBITAL_FLAG_TRANSPARENT: char = 't';
 
+#[derive(Debug)]
 pub struct Window {
     window_socket: Arc<RedoxSocket>,
     redraws: Arc<Mutex<VecDeque<WindowId>>>,