Water & Land performance improvements

[list] [*] Water: Performance increased [*] Water: Combination system improved [*] Water: River course now better adjustable [*] Water: Size limit of Lake and Ocean removed [*] Land Plots/Castle Surface: Performance increased [*] Land Plots/Castle Surface: Size limit removed [*] Land Plots/Castle Surface: Outline resolution increased, making it less angular [*] Field: Performance slightly improved. Maximum size increased [*] UI: Scaling of elements by camera zoom improved [*] Size of save file further reduced. Memory and loading times further reduced [/list]