Make it possible to specify a culture for parsing floats

[keimpema]

I would like to be able to use the built-in number parsers (pfloat, numberLiteral) with a specific culture so that I can parse numbers with a comma as a decimal separator. Correct me if I'm wrong, but this does not seem possible at the moment.

[hglee]

It is hard coded, you need to write new number parser.

fparsec/FParsec/CharParsers.fs

Line 996 in 156cbd7

if isDigit c || (c = '.' && (opt &&& allowStartingPoint) = allowStartingPoint) then

fparsec/FParsec/CharParsers.fs

Line 1153 in 156cbd7

System.Double.Parse(nl.String, System.Globalization.CultureInfo.InvariantCulture)

fparsec/FParsecCS/HexFloat.cs

Line 233 in 156cbd7

} else if (c == '.') {