Update to egui 0.28.0 #221

Job	Run time
Check	2m 1s
Check wasm32	1m 25s
build (macos-latest, aarch64-apple-darwin)	1m 57s
Clippy	2m 10s
build (macos-latest, x86_64-apple-darwin)	1m 37s
Rustfmt	19s
build (ubuntu-latest, arm-unknown-linux-musleabihf)	3m 44s
Test Suite	5m 7s
build (ubuntu-latest, armv7-unknown-linux-musleabihf)	4m 3s
trunk	1m 35s
build (ubuntu-latest, x86_64-unknown-linux-musl)	3m 42s
build (windows-latest, x86_64-pc-windows-msvc, .exe)	4m 37s
	32m 17s

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