pirate fleed

Yeay Pirates! 
This PR adds pirate ships to the game. Pirate ships are ugly, bulky chunks of metal. Usually subject to rust and erosion, many pirate ships are more red and brown than their original grey. All Pirates wear a typical skull somewhere on the ship.
While lacking big vessels, the pride of all pirates is their gunboat, a altered version of the frigate, featuring an impressive cannon on top.

Also adding in this PR: flyingTortress and starTortress, two Tortoise themed ships :)