Upgrade Bevy to 0.11

[nelson137]

Bevy 0.11 Upgrade

Guide

Bevy Startup Tree

• New App::add_systems syntax, use it for everything, & remove base sets (link)
• apply_system_buffers renamed to apply_deferred (link)

Gambit

• New App::add_systems syntax, use it for everything, & remove base sets (link)
• Audio bundles are entities, must be spawned (link)
• Replace all App::add_plugin (singular) with App::add_plugins (plural) (link)
• UI Style fields renamed (link)
• Access the current Res{,Mut}<State> through its getter (link)
• Command::write renamed to Command::apply (link)
• Add #[derive(Event)] to events (link)
• Replace OnUpdate(<state>) with .run_if(in_state(<state>)) (link)
• Interaction::Clicked renamed to Interaction::Pressed (link)
• UI Layout (link)
  • UiSystem::Flex renamed to UiSystem::Layout
  • Added support for CSS grid (PR)