q/acc: make it easier to upgrade the minter so projects can add inflation later in their life cycle

The ERC20 token contract shouldn't doesn't have an owner (as it triggers a lot of flags in third-party apps) so ownership over the account that is the minter is not ideal. The ideal solution is that the contract that has the authority to call the mint function can evolve over time, either by being upgraded, or by having a function that can let other contracts call the mint function.