Fix several CLS bugs

[jabraham17]

This PR fixes two CLS and adds a workaround for an existing chplcheck issue.

• Prior to this PR, name locations where not being recorded for enum element

  enum A {
    a = 123 // the location is `a = 123`, the name location is `a`
  }

• Prior to this PR, inherit expressions and expressions inside enum elements were not being properly scope resolved by chapel-py

  class CC { }
  class C: CC { } // now goto-def works on `CC`
  
  proc foo param do return 1;
  enum A {
    a = foo // now goto-def works on `foo`
  }

• Prior to this PR, chplcheck would report IncorrectIndentation for if/else if chains erroneously. While that bug still exists, this PR adds a skip for else if (similar to the public/private workaround)

Tested that start_test test/chplcheck and make test-cls both work.

[Reviewed by @DanilaFe]