chplcheck: allow ignoring parent/child incorrect indentation using @chplcheck.ignore

[DanilaFe]

This RP allows for disabling the IncorrectIndentation warning for statements that are incorrectly indented relatively to their parent:

@chplcheck.ignore("IncorrectIndentation")
module M {
proc foo() { // would warn; silenced by attribute
  writeln("Hi");
    writeln("There"); // still warns; attribute doesn't globally disable warnings
}
}

This helps the case in which a previously-implicit module is converted into an explicit module.

This code:

proc foo() {
  writeln("Hi");
    writeln("There");
}

Becomes:

module NewMod {
proc foo() { // would warn; silenced by attribute
  writeln("Hi");
    writeln("There"); // still warns; attribute doesn't globally disable warnings
}
}

Now, foo is incorrectly indented. To fix this, the entire file would need to be indented by two spaces, which creates a big diff and may be undesirable. By adding the ability to ignore an individual parent/child indentation violation using @chplcheck.ignore, this PR makes it possible to silence the warnings from explicitly defining NewMod, while preserving all other indentation warnings that had existed in the code previously (or would appear in the code in the future).

This PR also adds the chplcheck attribute to a list of well-known tools by the compiler, in preparation of using this attribute with the standard library.

Reviewed by @jabraham17 -- thanks!

Testing

• test/chplcheck

[jabraham17]

Looks good!

Can you also open an issue for the feature request we discussed offline, chplcheck.ignoreAll(ruleName) to ignore the rule in all children

[bradcray]

Woohoo! Thanks for the quick help here, Daniel!