[UP] Small modification.
[AD] Added PackFunctionInvoke.
[AD] The implementation of the dynamical function invoking.
[UP] Fixed some bugs about function invoking:
1.Exception NullReference, cause by redefining "@{args}" in parent and child block;
2.Messy AddVariable function in Scope.
3.Small bugs and small mod.
[AD] Added a debug function lib.