The maximum value of color must support upto #FFFFFFFF while validating value

[webfirmframework]

Currently, the maximum hex value allowed for color is #FFFFFF so Color.isValid returns false for the value above this. But, there is a chance for alpha value so the maximum value must be #FFFFFFFF.

[webfirmframework]

Modified related classes to support color value upto #FFFFFFFF. This fix will be available since 3.0.2.