Collapse whitespaces

[munrocket]

Can we add new setting svg({ whitespace: "collapse" }) and collapse whitespaces to one space?

'\n \t \n' -> ' ' '\n\n\n \n' -> ' '

[antony]

I'd be happy to accept a PR for this :)

[phun-ky]

@munrocket you could use svgomg before you save the svg to disk, so you don't have to do parsing after