Commercializers contract

[Ramarti]

There is a term in UML called commercializers, that dictates people can set an address that will determine if the minter/linker/receiver of an LNFT must be part of a known list of addresses.

The methods of determining this list could be varied. Basically, it's a synch hook from alpha, but with a less rigid structure.

• We need an interface such as:

interface ICommercializersChecker {
    function isAllowedCommercializer(address candidate, bytes memory data) external view returns (bool);
}

• We need to change UMLPolicy, substituting commercializers as a string array for:

commercializerChecker: address, // the address of ICommercializersChecker
commercializerData: bytes // abi.encoded data that will be set in the policy

UMLPolicyFrameworkManager must, on verifyMint() and verifyLink(), check that the IPAccount passes isAllowedCommercializer(policy.commercializerChecker, policy,.commercializerData), and uses the value to return true or false

• We can support a ERC721GatedCommercializersChecker.
  -- Singleton contract

function isAllowedCommercializer(address candidate, bytes memory data) external view returns (bool) {
    address tokenAddress = abi.decode(data, (address));
    return IERC721(tokenAddress).balanceOf(candidate) > 0;
}