Audit egui crates

[repi]

Yes I did actually manually (lightly) audit all these crates by opening up the exact versions and looking for unsafe usage (none found!), dependencies, ambient capabilities through std/core, and such.

And looks good! reviewing large Rust crates is not that hard when not using any such features 💯 Thanks @emilk 😃

Did find one under specified license though in epaint that I've stubbed out as a violation here

• Filed: Licenses for default embedded fonts not included in epaint crate license emilk/egui#2321
• Once this is resolved later we can enable the violation so previous versions will fail to be audited due to it. But can't do it yet because would fail cargo vet in our projects.

Part of:

• https://github.com/EmbarkStudios/ark/issues/6167
• https://github.com/EmbarkStudios/ark/issues/7090