Customisable colours

[SaucyPigeon]

Allow user to customise colors used in fertility display via mod settings.

[SaucyPigeon]

Other customisable options:

• (1.1): use vanilla or custom texture

May need to define a gradient def to allow easy patching for other mods

[SaucyPigeon]

(such as tilled soil with high fertility values)

[SaucyPigeon]

1.1.0 uses custom gradient class (benefit over UnityEngine.Gradient is that it allows for values over 1.0 and values past the contained range automatically go to the highest/lowest value accordingly).

Mod settings could allow user to add a t value and then assign a colour to it. Colour assignment could be three simple floats, ints or even a custom colour picker widget.