explore: press A to warp to the viewed location

In the paging camera, A now drops the player onto the map you're looking at. It
scans outward from the screen centre (wTileMap col 8,row 9 = the view centre) for
the nearest tile that IsTilePassable, adjusts wYCoord/wXCoord to it, sets
wDestinationWarpID=$ff so LoadMapData enters at those coords, and returns carry
set to close the menu and resume the overworld right there. Factored the view-
pointer math into SlopSetViewPtr (shared by the camera + the warp landing).

Verified: browse Pallet -> Route 1, A -> player lands on Route 1 at the centre
tile and walks around normally (sprite + Pikachu, wild data intact).

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