Add Policy Management function as Toyota's assets.

As overall functions, Policy management which Toyota contributes are the functions below.

• The function which manages the lifecycle of showing display and outputting sound of each application 
• The function which accepts request of each application about showing display and starting/stopping sound, judges priority and switchability on arbitration rule
• The function which abstracts and simplifies complex control of showing display and enables easy control from application layer
• The function which abstracts and simplifies complex control of outputting sound and enables easy control from application layer 
• The function which centralize the system information and vehicle information which HMI application needs and provides them