Add an OnUnbalanced hook for contract rent payments (#3857)
* Add RentPayment trait to runtime * clarify check * improve proof * Clarify further * Simplify RentPayment::on_unbalance calling and get rid of NonZeroRentHook
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- substrate/node/runtime/src/lib.rs 2 additions, 1 deletionsubstrate/node/runtime/src/lib.rs
- substrate/srml/contracts/src/lib.rs 3 additions, 0 deletionssubstrate/srml/contracts/src/lib.rs
- substrate/srml/contracts/src/rent.rs 4 additions, 2 deletionssubstrate/srml/contracts/src/rent.rs
- substrate/srml/contracts/src/tests.rs 1 addition, 0 deletionssubstrate/srml/contracts/src/tests.rs
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