A ModOptions unique allowing a mod to control which map gets preselected

[SomeTroglodyte]

The validation is a bit over the top, we could just as well leave it at silently ignore...

That first lint is because I was looking at the lat-am mod's validation, and it has a tile improvement "Darien Gap" which seems to be supposed to incur mountain-like damage an movement penalties. Yup, should be a Terrain - feature. But: Having the ability for improvements to change those attributes could make for interesting dynamics... Food for thought.

[SomeTroglodyte]

Draft because - consider #11485 first, this might then need a merge

[SomeTroglodyte]

Merged forward proactively and Re-tested with the following changed ModOptions on Latam (@Caballero-Arepa):

{
    "nationsToRemove":["Rio de Janeiro"],
    "modUrl":"https://github.com/Caballero-Arepa/Latin-American_Civs",
    "author":"Caballero-Arepa",
    "lastUpdated":"2024-06-01T06:58:51Z",
    "topics":["unciv-mod","unciv-mod-expansions","unciv-mod-maps"],
    "uniques":["Cannot be used as permanent audiovisual mod", "Mod preselects map [South America B]"]
}

[Caballero-Arepa]

That's great!