* Initial sketch of social recovery pallet
* Fix compilation issues
* Use a single total delay, rename stuff
* Check possible overflow
* Copyright bump
* Add mock for tests
* Add basic end to end test
* Add `create_recovery` tests
* Add malicious recovery lifecycle test
* Make clear we check for sorted and unique friends
* Work on some tests, clean up imports
* Change `if let Some(_)` to `ok_or()`
* More tests
* Finish tests, except issue with `on_free_balance_zero`
* Fix `on_free_balance_zero`
* Pallet docs
* Add function/weight docs
* Fix merge master
* OnReapAccount for System too
* Update weight docs
* Allow passthrough to support fee-less extrinsics