## Description
Fixes#5560. Also a couple other incidental changes / improvements:
* Add `EventType` that holds the actual string literals used for event
sending. With type checking, this can prevent subtle bugs resulting from
misspelled event names.
* Fix `HiddenFileTest` by using `bytestring_path()`
## To Do
- [x] ~Documentation.~
- [x] Changelog.
- [x] Tests.
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Co-authored-by: J0J0 Todos <jojo@peek-a-boo.at>
Co-authored-by: J0J0 Todos <2733783+JOJ0@users.noreply.github.com>
This was a vestige from when we used to need the unittest2 library for pre-2.7
compatibility. Now that we require Python 2.7, we aren't using that library
and this indirection wasn't doing any good.
- Add `beets.util.hidden` which adds a `is_hidden` function to check
whether or not a file is hidden on the current platform.
- Add tests for `beets.util.hidden`.
