Fix precision

[facelessuser]

• Handle small precision properly
• Zero precision will return value rounded to integer

Fixes #388

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[facelessuser]

Precision zero will give integer rounding and small values are rounded properly now.

> Color.util.toPrecision(23.3, 0)
23
> Color.util.toPrecision(0.222, 2)
0.22
> Color.util.toPrecision(1e-8, 3)
0
> Color.util.toPrecision(1e-8, 8)
1e-8

[LeaVerou]

Merged, thanks! But I don't think it fixes #388 entirely, since it was not only about serialization (sure, people can use toPrecision to map the coords, but it seems wrong to require jumping through hoops for common things).

[facelessuser]

Understood, my intention was only to fix the bug. I viewed the other part as an enhancement, one that an official direction was not yet decided upon.