Update winit dependency to 0.29

[Rexagon]

Tried to update winit to a new version. All the tutorials and examples were checked only on Linux with X11, so it’s better to check that it doesn’t break in other environments.

Changes in winit that affected the project:

• ControlFlow::Exit was moved to EventLoopWindowTarget::exit().
• EventLoop::new now return Result<Self, EventLoopError>.
• EventLoop::run() -> ! has been replaced by EventLoop::run() -> Result<(), EventLoopError>.
• EventLoopWindowTarget::exiting() can be used instead of a separate destroying flag.
• Requesting redraw on Event::AboutToWait (EventLoop 3.0 Changes rust-windowing/winit#2900).
• WindowEvent::KeyboardInput now contains a KeyEvent (instead of KeyboardInput).
• VirtualKeyCode is now the Key enum.

Changes in raw-window-handle (0.6) that affected the project:

• HasRawDisplayHandle, HasRawWindowHandle were replaced with HasDisplayHandle and HasWindowHandle.
• Getting display or window handle is now fallible (ends up in the unimplemented branch, this is probably wrong).

(Amazing bindings btw, thank you very much)

[Rexagon]

Finally managed to test this PR on Linux+Wayland, Windows and MacOS. All the tutorials and examples are working as expected.

[KyleMayes]

Thank you for your contribution!
Sorry for the long delay in getting it merged.
I'm working through the PRs and issues in this repository, I hope to have a new release out Soon™️