Setting to include dungeons in spawn entrance pool

[fenhl]

As far as I know, dungeon entrances were left out of the entrance pool for spawn positions not because it would cause bugs but for balance reasons (spawning inside a dungeon or directly outside of it can bypass item requirements).

This PR converts the “Randomize Overworld Spawns” checkbox into a dropdown setting, where the existing options are called “Off” and “Balanced”, and a new “Full” option is added which includes dungeon entrances.

The presets which previously had the setting enabled are S4 Tournament and Hell Mode. S4 Tournament stays on Balanced while Hell Mode gets upgraded to Full.

[Roman971]

This is just my opinion, but I personally don't think we should include dungeon entrances in the spawn pool.
The main reason for this is the setting is designed to randomize the "overworld" spawn, and having the overworld spawn lead to a dungeon seems weird to me.
In theory, we could include only the dungeon exits (leading to the overworld), but even then I don't think it would be worth turning the setting into a dropdown (which increases the GUI complexity quite a bit), since basically every dungeon exit is in an area with already a lot of possible entrances that can be picked as spawns.

It's worth noting that grottos/graves are excluded purely for technical reasons, but they are intended to be part of the normal spawn pool and should be part of it again whenever I get around to fixing the issues with them.

[Zannick]

I'm feeling the same way about the dungeon entrance spawns, so it looks like this isn't going to happen at this time.