Added a function that creates a color from a hexadecimal string. #229
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In response to issue #217 by Anton-4, I wrote a function specifically for creating an elm-ui color using a hexadecimal color code.
The hex function returns a color given a valid string, but returns red if the input was invalid. The string is considered to be invalid if it doesn't start with a '#' sign, if it isn't 7 characters long including the '#', or if it includes characters that do not exist in hexadecimal format.