[Enhancement] Move Izumi's Cave to Places After Discovery

[ElsaTheHobo]

Her cave doesn't magically move around from place to place, so realistically, the player should be able to reliably find it again. Also it gets in the way of Ebonflower grinding. The only issue I've seen with this when scouring the code is that there is no space to put it in the places menu without creating a second page; all 15 buttons are reserved. 3 of these buttons, though, are reserved for debugging and unfinished content (Prison, Ingnam, and the Beta Zone).

If the prison is as buggy as the on/off option says it is, it should be moved into the Beta Zone anyways. This would make room for Izumi's cave on the menu. Alternatively, there can be two pages, but it seems silly to only have a small number of places on the second page.