Improvement of the cost of instantiation

[makotok]

For instance generation of class.
It is realized by copying the variable to userdata.
Therefore, class variables increases, the instantiation expensive.

Consider whether be improved by utilizing the meta table.

[makotok]

I improved the logic of object creation.
However well, compatibility is lost.

There is a need to change in the following format.

-- Before
Class.__factory = MOAIObject

-- After
Class.__index = MOAIObject.getInterfaceTable()
Class.__moai_class = MOAIObject