Sailing Kit

Adds a craftable sailboat



physics, simplified but should work in the proper direction for the most part.
indirect control - instead of controlling the boat directly, 
    you control the sail and the rudder which exert forces on the hull.


left/right: rudder left/right
space: raise/lower the sail
    sail raised: loosen/tighten the sheet
    sail lowered: row forward/backwards

Updates: 191116 Turn rate improved 191026 Hit the boat a few times with something harder than hand to destroy it and reclaim some material. 191022 Smash the boat with some dye to color the sail.