* jit layer support multi thread

* fix bug

* clone prediector not do graph optimizer

* format

* fix comment and format

* fix override and fromat

* fix

* fix

* add interpretercore for jit engine

* add ut

* Rename class type Name2XX

* Fix return type

* Remove EngineMap function in layer

* Polish function code

* Rename funciton to engine

* Fix Log msg and doc

* Rename Function to Engine and using new Function class to warp Engine

* Rename EngineInfo

* Adjust member variable order

* Move Function classes to a sub dir

* Format code