Schema changes for Apps

refs #2465
- Add active field to app_fields
- Adjust data generator for app fields
It might be a good idea to add `0` and `1` to the list since sometimes export files can end up with zeros and ones for these types of fields.  See this comment from #3122:

> validator#isIn is being used to validate boolean fields (see: schema.js) but since validator methods operate only on strings, exported data that contains 0 or 1 for false/true will fail because they're first coerced to a string and the validation becomes comparing the string '0' or '1' against the strings 'false' and 'true'.