Move bonded function table into bonded.cpp

Move bonded function table into bonded.cpp

Instead of exposing the bonded functions for every function type
outside bonded.cpp, now a function in bonded.cpp dispatching
each bonded interaction fuction using a local table.
This is preparation for templating the bonded interaction functions.

This change is only refactoring.

Change-Id: I22d5f46b09fa00ca65e0359f963c1cc6bfb33aa9