Add exclusive fullscreen mode (#925)

* Add exclusive fullscreen mode

* Add `WindowExtMacOS::set_fullscreen_presentation_options`

* Capture display for exclusive fullscreen on macOS

* Fix applying video mode on macOS after a fullscreen cycle

* Fix compilation on iOS

* Set monitor appropriately for fullscreen on macOS

* Fix exclusive to borderless fullscreen transitions on macOS

* Fix borderless to exclusive fullscreen transition on macOS

* Sort video modes on Windows

* Fix fullscreen issues on Windows

* Fix video mode changes during exclusive fullscreen on Windows

* Add video mode sorting for macOS and iOS

* Fix monitor `ns_screen` returning `None` after video mode change

* Fix "multithreaded" example on macOS

* Restore video mode upon closing an exclusive fullscreen window

* Fix "multithreaded" example closing multiple windows at once

* Fix compilation on Linux

* Update FEATURES.md

* Don't care about logical monitor groups on X11

* Add exclusive fullscreen for X11

* Update FEATURES.md

* Fix transitions between exclusive and borderless fullscreen on X11

* Update CHANGELOG.md

* Document that Wayland doesn't support exclusive fullscreen

* Replace core-graphics display mode bindings on macOS

* Use `panic!()` instead of `unreachable!()` in "fullscreen" example

* Fix fullscreen "always on top" flag on Windows

* Track current monitor for fullscreen in "multithreaded" example

* Fix exclusive fullscreen sometimes not positioning window properly

* Format

* More formatting and fix CI issues

* Fix formatting

* Fix changelog formatting

FEATURES.md

@@ -84,6 +84,9 @@ If your PR makes notable changes to Winit's features, please update this section
 - **Fullscreen**: The windows created by winit can be put into fullscreen mode.
 - **Fullscreen toggle**: The windows created by winit can be switched to and from fullscreen after
   creation.
+- **Exclusive fullscreen**: Winit allows changing the video mode of the monitor
+  for fullscreen windows, and if applicable, captures the monitor for exclusive
+  use by this application.
 - **HiDPI support**: Winit assists developers in appropriately scaling HiDPI content.
 - **Popup / modal windows**: Windows can be created relative to the client area of other windows, and parent
   windows can be disabled in favor of popup windows. This feature also guarantees that popup windows
@@ -157,6 +160,7 @@ Legend:
 |Window maximization toggle       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
 |Fullscreen                       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|❌        |
 |Fullscreen toggle                |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|❌        |
+|Exclusive fullscreen             |✔️     |✔️     |✔️         |**N/A**         |❌    |❌     |❌        |
 |HiDPI support                    |✔️     |✔️     |✔️         |✔️             |▢[#721]|✔️    |✔️         |
 |Popup windows                    |❌     |❌     |❌         |❌             |❌    |❌     |❌        |