[RFC] [BREAKING] mandatory default package identifier for Android

[brody2consult]

with blank default package identifier

followup item for PR #153 - add native item with package ID to package.json

Note that this proposal is using back-ticks instead of single quotes. I think this is a little more proper for templating in general.

TODO items:

• fix Android package identifier description text (PR fix Android package identifier description text #155)
• test CLI with this update
• update test suite using Stryker Mutator to help ensure no loss of test coverage
• start using back ticks through the rest of the code (and tracking this update), maybe with some help from the eslint tool