R1:081300c7f861

Modernize some Harbormaster Controller/Policy infrastructure

Summary:
Ref T8095. This is just general groundwork for more exciting changes:

- Use more modern conventions around controllers, UI elements, and dialogs.
- Provide real CAN_EDIT policies and policy checks (they just don't do anything yet).

Test Plan:
- Used all affected controllers.
- Faked CAN_EDIT to POLICY_NOONE and verified everything was greyed out and unselectable.

Reviewers: btrahan

Reviewed By: btrahan

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