* initial commit for splitting payouts
Collateral goes to slot's host address, while reward payouts go to the slot's host payoutAddress
* Add fillSlot overload to make payoutAddress "optional"
* add tests for payoutAddress
* add doc to patchFillSlotOverloads
* formatting
* remove optional payoutAddress parameter
* Move payoutAddress to freeSlot
- remove payoutAddress parameter from `fillSlot`
- remove `payoutAddress` from slot struct and storage
- add payoutAddress parameter to `freeSlot`, preventing the need for storage
* formatting
* update certora spec to match updated function signature
* Add withdrawAddress to withdrawFunds
- prevent erc20 msg.sender blacklisting
* Update tests for paying out to withdrawAddress
* formatting
* Add collateralRecipient
* refactor: change withdrawFunds and freeSlot overloads
- `withdrawFunds` now has an option withdrawRecipient parameter
- `freeSlot` now has two optional parameters: rewardRecipient, and collateralRecipient. Both or none must be specified.
* update certora spec for new sigs