Fire Shrine often disappears

[o11c]

The random warping appears to be a workaround for the fact that the map has inaccessible areas (which should be fixed independently! though you can always use a Wilco Jet Pack), but it shouldn't move while the player is in the cave.

Especially in combination with the fact that the map doesn't properly refresh when the object moves ...

[o11c]

I've isolated some of the bugs here:

• Update is also triggered when the game is loaded. So, it is possible for the shrine to be there when you save, but not when you come back.
• After update is triggered and the condition is satisfied, the shrine disappears entirely until the map is left and re-entered.
• The common case is that the player has been off doing other things, thus variable 103 is outdated and the update is satisfied.

Still not sure how the "shrine appears on screen but isn't really there" bug comes from, but that'll probably be fixed by building a proper toolkit rather than relying on ad-hoc imperative drawing. Probably should give every gear a 'dirty' flag.