Optionally quit wild battles if there are no rare upgrades to be found

[viridis]

Existing Prompt for Forfeit functionality adds a popup if PetTracker does not sense an upgrade while entering a wild battle.

While trying to get every BattlePet to Rare without spending an infinite amount of stones on them, I would have liked a functionality that allows me to leave the combat if PetTracker senses there are no Rare pets in the wild pet pool.

This PR would add a checkbox on the interface

And this checkbox would add the functionality that even if there are upgrades in the current wild battle, it still adds a popup if that upgrade is not a Rare upgrade

I only added English localization. I went through a few files and it seemed like not everything is up to date with the English version, so I'm assuming there is a fallback anyway. I hope this is alright.

[Jaliborc]

Sounds very reasonable, and code looks good. I'm gonna merge this, but turnt the option into a dropdown of 3 modes I think (dont forfeit, forfeit, forfeit on non rare)

[Jaliborc]

And optimize the rare upgrade detection