The default sort of fishing spots ends up drawing further things on top of closer things, as it has no relation to the camera. To solve this, convert the camera point to a `LocalPoint` and then sort by comparing local points from the NPC to the camera's point. However, the sort is inverted by `-1 *` so that further things are drawn first, and closer things are drawn last--this way closer things are always on top. Fixes #1737