Bevy 0.7

[aevyrie]

This is based on #78 for egui 0.17. If that is merged, I will rebase on main.

This branch will be used to track bevy/main until the next release.

The biggest upgrade is support for low power mode in bevy (bevyengine/bevy#3974). I've added a few lines to process_output that checks if egui has reported needs_repaint, and sends a bevy RequestRedraw event. I've also updated the examples to use the new WinitSettings::desktop_app() mode for reactive rendering.

This means bevy_egui apps can now use zero resources unless the user is providing input, or there is an egui animation in progress!

[aevyrie]

@forbjok I merged your branch here to get the two_window example working. This branch has some additional integrations to work with the new low power mode in 0.7.

[vladbat00]

Is PresentMode::Mailbox needed in this example?

[vladbat00]

I guess one of these is redundant

[vladbat00]

Thanks a lot for the PR! I'll make a new release soon.

[aevyrie]

@mvlabat something I added that could use more discussion was the present_mode and the WinitSettings for low power. Maybe these should be removed from the examples, and instead added to a dektop_app example or something. It would be good to discuss how you can use these settings to improve input latency and power use. People using this library for games probably won't want to use those settings.