Add ToString Methods to RoomGens

All non-abstract classes that implement `RoomGen` must override `ToString()` in a way that summarizes their members.

Ex. A `RoomGenSquare` with Width 8 and Height 5 would be `RoomGenSquare [8]x[5]`

Locate every non-abstract class implementing RoomGen and inspect its members to determine the summary each ToString() should provide. Use the RoomGenSquare example as the expected format, then verify that each implementation includes its relevant member values and that all applicable classes are covered.

Written by the indexing model from the issue text.