monitor: refactor MonitorHandle to store dyn object

This also alters `VideoMode` to be a regular object and not reference
the `MonitorHandle`, since it's a static data.

Given that `VideoMode` set may change during runtime keeping the
reference as a some sort of validity may not be idea and propagating
errors when changing video mode could be more reliable.

src/platform_impl/orbital/mod.rs

@@ -4,8 +4,6 @@ use std::{fmt, str};
 
 pub(crate) use self::event_loop::{ActiveEventLoop, EventLoop};
 pub use self::window::Window;
-use crate::dpi::PhysicalPosition;
-use crate::monitor::VideoMode;
 
 mod event_loop;
 mod window;
@@ -133,29 +131,3 @@ impl fmt::Display for WindowProperties<'_> {
         )
     }
 }
-
-#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
-pub struct MonitorHandle;
-
-impl MonitorHandle {
-    pub fn name(&self) -> Option<String> {
-        None
-    }
-
-    pub fn position(&self) -> Option<PhysicalPosition<i32>> {
-        None
-    }
-
-    pub fn scale_factor(&self) -> f64 {
-        1.0 // TODO
-    }
-
-    pub fn current_video_mode(&self) -> Option<VideoMode> {
-        // (it is guaranteed to support 32 bit color though)
-        None
-    }
-
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
-        std::iter::empty()
-    }
-}