* Support moving single layers
* Fix "Move layer to top/bottom" keybinds
* Rename things named "move" to "reorder"
Fix formatting
* Combine sorted layer helper functions
* Use integer consts for moving layers to front/back
* Fix merge mistake
* Fix some clippy lints
* Fix panic
* Remove "get" prefix from functions
* Bring layer menu items out to sub-menu
* Support moving multiple layers at a time
* Add comment explaining odd keybinding
* Add reordering tests
* Add negative test
* Add new error type
* Add layer position helper, clean up tests
* Make position helper return Result
* Clean up slice iteration
* Simplify source_layer_ids computation
Co-authored-by: Dennis Kobert <dennis@kobert.dev>
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