move core_write.cpp to utils from common
move core_write.cpp to utils from common


Former-commit-id: 8006d73a8c4d2fa6678d793ac0017393572afb0b
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin2