Get web examples running again

[Nisatru]

Heya!

First things first, thanks for developing this great library!

I recently started experimenting with integrating iced into an existing wgpu application that targets native as well as the web.

Im well aware that web is not the main focus of development, but since there are some examples that have some setup for running on the web, I updated them to build and run again.

The following (web) examples have been updated:

• Counter
• Integration
• Todos
• Tour

With getting the tour example running again this should fix #1522 .
The cause for the RuntimeError: unreachable as described in the issue #1522 back then is likely not the same as now, since the example changed in the meantime.

Anyways the issue description still fits the current situation "When starting the tours app it crashes on load (only web)".

The reason for the RuntimeError: unreachable is the line tracing_subscriber::fmt::init(); which panics when running on the web.

I added console_log for logging and a panic hook to also log panics in the browser console, similar to the integration example, so next time we encounter a RuntimeError: unreachable we should get a more descriptive error message.

I have also updated the READMEs where necessary.

Note: Text is not rendered on the web because no font is loaded, which is ignored here because it is another already known topic.

[hecrj]

Thanks! Looks good. Just a small suggestion!

Hopefully we can remove the webgl feature soon!

[hecrj]

Awesome! Thanks 🙇