Support alphabetical sorting of outdated packages

[olets]

Suggestion type

The way Cork looks

What is your idea about?

I find the outdated packages list hard to use when there are many outdated packages. It'd be helpful for me if the app supported listing outdated packages alphabetically.

Why should this be added?

There is precedent for this in the sidebar (#78)

Keeping it real

• Adding suggestion idea is realistic

[olets]

(edited in light of your response to my question in 78 (thanks!))