Option for sorting feeds in folders

[DavidMunch]

Is your feature request related to a problem? Please describe.
RSS feeds in folders are currently just thrown together in a big heap, so if you are looking for a specific one to remove or rename it, it may be like searching for a needle in a haystack. This would also help in finding feeds that are inactive.

Describe the solution you would like
A way of sorting feeds in a given folder. Either in the moment, or perhaps a permanent filtering/sorting setting for each folder, that takes new feeds into account and positions them correctly when added.

Describe alternatives you have considered
Under the Folder menu and when right clicking a folder, I'd like a sub-menu with options to sort feeds by:

1. Name
2. Date added
3. Latest activity
4. Number of unread entries.

Additional context
You guys rock!