Provide a means to save customized heroes locally

[AlmostMatt]

For example, I have a team of heroes that I use often. I want to be able to save them so that I can come back at a later time and see how my unit does against some specific enemy.

This would be relevant for checking damage for a specific enemy in an actual game, or for saving customized opponents like Fury Lucina, Vantage Takumi, Swordbreaker Nowi, etc.

I was thinking that if we could add tabs above the hero list at some point for this sort of thing (all heroes, my heroes, etc)

[ajhyndman]

Yeah, I've been wanting something like this too. Technically you could just create a bunch of links and save them somewhere. But who wants to do that.

[ajhyndman]

I think #55 will make this doable.