For PRs, this should give a more accurate list, as the previous method would
diff to the tip of the `master` branch, which could include new commits (and
thus changed files) not present in the PR branch.
codespell's `--skip` option doesn't work at all with folders when used
together with an explicit list of paths to work with, so let's not use it.
Instead of reading files over the network, the new version uses a local file cache and only updates files when it changes.
The original remote filesystem was created 14 years ago, when ethernet was faster than hard drives or even flash. Also, mobile devices have a very small amount of storage.
Nowadays, this is no longer the case so the approach is changed to using a persistent cache in the target device.
Co-authored-by: m4gr3d
Also start organizing editor-specific GUI components
into a dedicated folder, `editor/gui`.
Also move `editor_file_server` next to the rest of debugger classes.
