Add moving fishing spots

[Major-]

The fishing spots can move positions over time, but the Fishing plugin doesn't support this. To implement this we need to identify the positions fishing spots can move to (requires members OSRS and is probably time-consuming. but otherwise super easy), and adding a task to move them about (relatively easy).

[Promises]

i can lend you a members osrs account if you wish?

[Major-]

This is probably a good task for someone new to apollo to help out with, and as it doesn't really matter if it's not implemented for a while, I think I'll leave this for someone else. Thanks a lot for the offer though