Update eframe, add trunk setup

[AngelOnFira]

This takes the work started in #9, and updates eframe.

I'm going to start this as a draft PR, since although everything compiles, there are still some areas that I need to fix, and have questions about.

The biggest item is migrating the use of the App trait; previously, the setup function was used to prepare the websocket listener. Some of the logic in this PR might not be feature similar just yet.

This will close #9.

[duckfromdiscord]

awesome to see you used my issue & commit :) good luck with the PR!

[Its-Just-Nans]

Hi

@AngelOnFira is this going to be merged ?

[emilk]

This has been in draft for too long. Please try to make your PRs small and focused. If you want to update eframe or add trunk, please do so in separate PRs