Sublinks Native API #119

Create basic CRUD restful endpoints for the core entities:

1. Announcements
2. Comments
3. Communities
4. Instances
5. People
6. Posts
7. PrivateMessages

This means each resource will have a POST, PUT, GET support in the following format:
Create: POST /api/v1/{resource}
Read: GET /api/v1/{resource} & GET /api/v1/{resource}/{id}
Update: PUT /api/v1/{resource}/{id}
Delete: DELETE /api/v1/{resource}/{id}

Do not create and RPC endpoints. For example, instead of adding a moderator to a communtiy like this: POST /api/v1/community/sublinks/addModerator do it like this: POST /api/v1/community/sublinks/moderator. Then create a new Controller for moderators with CRUD actions to create, read, update, and delete moderators from a community. An update for example could change the sort order of moderators.