- Catchers now carry `TypeId` and type name for collision detection
- Transient updated to 0.3, with new derive macro
- Added `Transient` or `Static` implementations for error types
- CI should now pass

See catch attribute docs for the new syntax.

- Add Error trait
- Use Option<Box<dyn Error>>
- Update Responder to return a result
  - Update all core implementations

- Update Responder derive to match new trait
- Update lifecycle to deal with error types correctly
- Update catcher rank to ignore type - now handled by lifecycle

Still has several major missing features, but is back to passing CI.

- The previous `on_request` was unsafe, now uses a separate
  `filter_request` method to ensure `error` only contains
  immutable borrows of `Request`.
- Added full safety comments and arguements to `erased`.
- Added extra logic to upgrade, to prevent upgrading if an
  error has been thrown.