Feature request: Option to reduce multiple newlines to 1

[webprofusion-chrisc]

Thanks for making this extension! I find that while moving code around I often have multiple newlines (2 or 3) and I'd like to be able to reduce that to 1 empty line where there are multiple, so still keep some line spacing between, but not an inconsistent amount.

var a=123;
var b=345;


var c=a+b;

would become:

var a=123;
var b=345;

var c=a+b;