Rename Everything/Anything to Not Exists/Exists

[Valeskas]

In combinators, Everything is equivalent to Not Exists with negated condition, Anything is equivalent to Exists with condition as is.
In Everything->Not Exists case condition should be negated automaticaly during map migration.

I think that suggested names are way more clear, but I am not a native english speaker.

[Jürgen Erhard]

"Everything > 4" reads perfectly fine. Same for "Anything < 100".