Swap/cycle multi-cursor selections

[AlbatorLaho]

I would love to be able to swap or cycle through selections with multiple cursors.
e.g. if you have a selection foo and selection bar, and you "cycle" the selections, foo would be replaced with bar and vice versa!

Here's an example, using |...| to indicate a selection... (hopefully it makes sense)

{
  "foo": "|foo|",
  "bar": "|bar|",
  "baz": "|baz|",
}
// the above would become >>
{
  "foo": "|baz|",
  "bar": "|foo|",
  "baz": "|bar|",
}