Add COW string
    Rebuild Vector
        Use COW : when is the Value-type and struct don't hasElaborateAssign
        Use Deep-Copy : when hasElaborateAssign
        Disable copy: when is Ref-Type and Pointer
    Change async-socket all CallBack to nothrow
    Rm yu.array.IAppder
    add yu.traits.isRefType


https://github.com/dushibaiyu/yu/releases/tag/v0.1.0-b1