[feature request] Sort tags by alphabetical order

[denliner]

Thank you for that useful tool.

I would really like to have the ability to sort tags by alphabetical order to keep some consistency between images that have been tagged with sd-tagging-helper and those that have been scraped from a booru.

[arenasys]

added in 9cbab95. available in the edit menu, right clicking the existing sorting button or with Ctrl+Y.
I should say that tag order does matter for training, the starting tags of the prompt have more emphasis, so sorting alphabetically may not be optimal.