some modification of the include file of each file

- FIX : when physics property is constructed in each vertex,  e_density should be initialized to 0
- ENH : enhance the method for output boundary condition type in SctmDebug
small change on Phys

- CHG : change Phys member in FDVertex to a pointer
decouple the head files

- ENH :  use forward declaration of friend class to decouple
solve problem on electron mobility of boundary vertex

- ENH : use different parameters in method for filling vertex physical value using material property to solve previous problem on the electron mobility of boundary vertex of trapping layer