Advanced Management function

action.h  : ACTION_ADVANCEDINV 
action.cpp value : "advinv" , to bind the function. Suggested key "/" 

This function allow the player to manage the area around the player and his inventory.

![advancedinv](https://f.cloud.github.com/assets/197371/356179/dc1a5fdc-a0fc-11e2-894a-d997f9042bfa.png)


I also added a few helper method to player,game,inventory. A diff probably will get the changes.