Rework Triggers field
	* Update Triggers field to be a multi heredoc field
	* Fix Validator to properly check Triggers in parent and splitoffs

New Triggers field looks like
```
Triggers: <<
  Activate: <<
    %p/foo
  <<
  Interest-noawait: <<
    %p/blah
  <<
<<
```

Where currently only activate, activate-noawait, interest and interest-noawait are valid subfields.