Image swapping & resized notice updates

* Replaced the "hide original notice" option with the "resized notice display" option to allow more control over the resized notice.
* Added a bbbHotkeys function that allows for future hotkeys and currently overrides Danbooru's new hotkey for swapping between the original and sample images.
* Added a new link to the sidebar options menu that can be used to swap between the original and sample image.
* Updated the image swapping to allow the user to cancel the image swap.
* Updated the resized notice with "cancel" and "retry" messages.