Extract time values from CSS

[willmcgugan]

Values for time in transition rule (and potentially elsewhere) are parsed in to a Scalar object.

Time is technically a scalar, but it adds a bit of confusion to the Scalar class which is mostly used for dimensions.

We should drop the use of Scalar for time and define another object to store the times. Perhaps an object for time is overkill, and we should simply use a float for seconds.

Ask WM for a tour of how CSS is parsed in Textual before attempting this one.

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