Update egui to version 0.29 and glow to 0.14

[evan-barentin]

Hello,

This is a small PR to update egui to the latest release. As egui now needs glow 0.14, the upgrade was done too. But maybe should I have done it in another PR ?

The 0.29 version of egui introduces a dithering option and I had to update the code according to it, but maybe not like you would have done it. Feel free to ask for changes and I will adapt the code :) cf:

• https://github.com/emilk/egui/pull/4497
• https://docs.rs/egui_glow/latest/egui_glow/painter/struct.Painter.html#method.new

And everything seems to be fine with a cargo test --all-features --all-targets

Have a nice day,

[asny]

Looks good to me. Thank you for your contribution 🙏

[evan-barentin]

Thanks for the review and this pleasant crate. It’s a pleasure to work with.