Adding mapping treatment to FunctionType
Adding mapping treatment to FunctionType

Plus a TypeResolution test for it

LianaHus/solidity,douglas-larocca/solidity,vaporry/solidity,ruchevits/solidity,gluk256/solidity,debris/solidity,shahankhatch/solidity,ruchevits/solidity,arkpar/solidity,ethers/solidity,chriseth/solidity-doc-test,ruchevits/solidity,chriseth/solidity,ruchevits/solidity