Rename all to iter

[bugadani]

Thank you for helping out with embedded-graphics development! Please:

• Check that you've added passing tests and documentation
• Add a CHANGELOG.md entry in the Unreleased section under the appropriate heading (Added, Fixed, etc) if your changes affect the public API
• Run rustfmt on the project
• Run just build (Linux/macOS only) and make sure it passes. If you use Windows, check that CI passes once you've opened the PR.

PR description

As discussed in #596 (comment)

[bugadani]

@rfuest is the associated function used anywhere?

[rfuest]

@rfuest is the associated function used anywhere?

Yes, but not in e-g itself. It's used in the new font conversion tool.

[rfuest]

@jamwaffles How should we handle this breaking change? I don't think it requires a new beta release on its own, because only a very limited set of other crates will depend on this API.

[jamwaffles]

I agree, I think it's fine to release it with other work. It's also trivial to update code to use the new name, so the impact is low for a breaking change.

Also, congratulations to us on 600 PRs/issues 🎉!

[bugadani]

I'm a bit ashamed the 600th wasn't something bigger, to be honest 😅

[jamwaffles]

I'll be posting people cake when we hit #1000 so make it worth it ;)

[rfuest]

I'll be posting people cake when we hit #1000 so make it worth it ;)

Don't tempt us or you'll need to review a lot of very small PRs in the near future 😉.

[bugadani]

Nah I bet the cake is a lie.