Folders for brews

[ericscheid]

Your idea:

Issue #758 started off with this idea, but got diverted into developing tags and tag filters.

I've got a lot of brews, and I imagine others do as well. It would be great to be able to organize these into folders that I can drill into for specific brews. For example, I might want to have one folder for each campaign that I'm running, or one to hold my custom magic items, or another to hold my custom races and classes.
-- HeruAsatru

Folders are still a useful and important concept that tags can't completely solve, thus am rebooting this feature request.

See folders idea for detailed planning and discussion.