*alterations to playerclass*

$fixed and buffed multiclassing functionality
 -added xp to classes
 -split getCharExperience into two submethods for flexibilty
   +getCharClass(i).getXP() //returns xp of class i
   +getTotalXP() //adds all the class xp together
   (this adds more power being able to menipulate class xp 
    individually by class)
 TODO: make effective current level calculate with xp ammounts
       rather than be set