Highlighting does not work for .repl files and many newer pact functions

[severian1778]

We noticed that vim pact does not work with .repl files nor does it highlight many interesting functions in pact like fold-db and lambda.

To increase user expereince and make educational videos more legible and accessible, an update of these two items via adding of .repl support and inclusion of newer pact primitives into the highlight list would be very helpful.