[1.x] Prop consistency

[jessarcher]

This PR makes the following opinionated changes:

React

• All props are now destructured to clearly show what props are available.
• The AuthenticatedLayout component now accepts the user object directly. It is also no longer passed the errors prop which it wasn't using.

Vue

• There were three different usage styles of defineProps so I've made them all consistently the full format.
• The checked prop of the Checkbox component is now required.
• The redundant type prop has been removed from PrimaryButton and DangerButton. These are already submit by default and can be changed without a prop.

These changes all made it easier to convert the stubs to TypeScript in #267. I believe they will also make it easier for users that want to adopt linters like https://eslint.vuejs.org/ in their projects.