R1:8c1c6fec5ac9

Modernize policies in Paste and Macro

Summary:
Ref T603. Fixes T2823. This updates Paste and Macro.

- **Paste**
- Added default view policy.
- I didn't add a "create" policy, since I can't come up with any realistic scenario where you'd give users access to pastes but not let them create them.
- **Macro**
- Added a "manage" policy, which covers creating and editing macros. This lets an install only allow "People With An Approved Sense of Humor" or whatever to create macros.
- Removed…