Modify Seagull movement and attack Behaviour

[plexsoup]

Seagull was created as a realtime path follower. We decided to use turn-based movement instead of realtime.

Modify seagull to take discrete steps. Come up with a method which allows level editors to easily add seagull paths to the tile map.

[plexsoup]

From discord:

Diarmuid: update: The seagull should only remain in each position for 2 ticks, attacking on each one, before flying on a third tick to the other position (it does not damage anything while it is flying [maybe it could scoop up a flying fish? lol]) Diarmuid: Additionally, the designer should be able to choose the positions on the tilemap it moves between, rather than it moving back and forth between a position consistently relative to where it was placed

[plexsoup]

seagull moves in a stepwise fashion now.

I still have to implement the 2 tick attack hold and reconnect the flying animation.