New EXIT MACRO action for clarity

[_jims]

@tiffle

When subroutines were introduced to KM they also came with the Return action and this is what you can use to exit a macro immediately - even if it is not a subroutine macro.

I'd like to add...

Even if a subroutine macro does not include a value to return, use Return Result.

I mistakenly tried to use Cancel Just This Macro and @peternlewis set me straight: "Cancel Just This Macro" in a Subroutine