ticket:9101: RBC::hashCode(), and better operator==()

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34439 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: RBC::cloneBinary(), cloneRuleData(), and constructor(from binary)

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/markus@34440 251d0590-4201-4cf1-90de-194747b24ca1