Add "The Missing Bundle"

[kihashi]

In 1.4, there's a new bundle- https://stardewvalleywiki.com/Bundles#Abandoned_JojaMart

[kihashi]

From discussion in #150 -

Regarding issue #137 - I've been thinking about it and I think I want to add a bit more in the way of options around it. For example, how should it fit with the existing spoilers system since it's end game content? If it's not shown by default, should the user be prompted to show it once they complete the community center? Regardless, I'd prefer to have that as a separate PR so that we can discuss those changes separately.

• What's the best way to include this?
• How does it fit into "spoilers"?

On the one hand, this is information that is not available to you from the game's UI (and therefore falls under spoilers). On the other hand, it adds more work to do it as a spoiler bundle.

Here's my proposal-

• [ ] Add a boolean attribute to each room and bundle titled end_game that would be true for this new room and bundle and false for all others.
• [ ] Add a new spoilers setting- showEndGame
• [ ] Update room and bundle filtering to account for the new spoiler setting