Update to egui 0.28.0 #222

Job	Run time
Check wasm32	1m 27s
Check	2m 11s
build (macos-latest, aarch64-apple-darwin)	1m 40s
build (macos-latest, x86_64-apple-darwin)	1m 43s
Clippy	2m 9s
Rustfmt	17s
Test Suite	4m 53s
build (ubuntu-latest, arm-unknown-linux-musleabihf)	3m 59s
trunk	1m 35s
build (ubuntu-latest, armv7-unknown-linux-musleabihf)	3m 39s
build (ubuntu-latest, x86_64-unknown-linux-musl)	3m 33s
build (windows-latest, x86_64-pc-windows-msvc, .exe)	5m 57s
	33m 3s

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