Water improvements

[list] [*] Update rate and performance of water increased [*] Water now has no black border line by default. A button at the top of the UI now allows you to enable or disable the border line [*] The edges of the river are now created more organically (Note: you can change the width of the river per point) [*] Boats and ships [*] Density of forest increased [*] Especially fixed bugs concerning water and other minor things [/list]