Add Warehouse into the game

[LinuxDonald]

Our first Building should be an Warehouse that could be build from the Ship when there are enough resources.
Only one Warehouse could be build per island of an player. An other Player could build to one on the same island.

Warehouse graphics for Tier 1: https://github.com/unknown-horizons/unknown-horizons/tree/master/content/gfx/buildings/settlers/warehouse/as_warehouse_settler0/idle

[Beliar83]

I would like to work on this, but I am not sure if this can be done, or at least finished, before having a general structure for the islands/map.

[Beliar83]

I can, at least, look into importing the gfx into godot, though.

[Beliar83]

Anyone have comments on how the warehouse sprite is imported into godot in the commit?

[Royber121]

Check out https://github.com/Royber121/godot-port/tree/Building-Placement

Still very rough but it's a start.