[2.0.23] Possible deadend on island setting

[Dreepa]

Situation:
-New player chooses island world.
-Player does not yet know that biter spawners are required for progression in SA, and has already cleared the island of all biters before that.

Problem:
-No communication in map selection that island may become a dead end (other map types can generate new chunks through exploring and thus create spawners, island map type cannot).

-Player is stuck in progression, when getting to the point where biter spawners need to be captured.

Suggestion:
Improve communication to player about this possibility when selecting island map subtype to avoid heavy frustration.

[Nemoricus]

Alternative: move biter egg dependency to prometheum science.

[Rseding91]

Thanks for the report. I'm putting this in Minor Issues.