eframe web: detect and report panics during startup #2992
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With this PR we now report panics during startup, e.g. due to a panic in
wgpuor the app initialization code.This lead to a very nice refactor of
eframe::webAnother change is that the first
paintis now delayed until the firstrequestAnimationFramecallback. This means the initialization is much faster, which is probably a good idea.