Fixed some compile warnings
Merged Pull Request: New Color methods
* Added Lua implementations of HSVToColor & HSLToColor for higher performance and ensuring it has the color meta table
* Added HWBToColor
* Added COLOR:ToHWB()
* Added COLOR:GetHue, SetHue, AddHue
* Added COLOR:GetSaturation, SetSaturation, AddSaturation
* Added COLOR:GetBrightness, SetBrightness, AddBrightness
* Added COLOR;GetLightness, SetLightness, AddLightness
* Added COLOR:GetWhiteness, SetWhiteness, AddWhiteness
* Added COLOR:GetBlackness, SetBlackness, AddBlackness
Remove math.IsNearlyZero as it is just too similar to math.IsNearlyEqual