Big Chillin XP Redux

Removed two commands: bcxpusemultiply and bcxpusedivide

Modified and expanded the XP formula for more in depth customization to XP earning; Example ([DMG * 1] + [MHP / 3]) + (PLVL / 10)

Added ability to choose any possible operand in the formula within the given format.

Added a new command allowing users to define the xp formula (bcxpsetmath)

Added addition and subtraction to possible operands.

Added two more user-definable integers for a total of three user defined integers to be used in the XP formula.

Added three new commands to change the value of each user-definable integer (bcxpinteger1, bcxpinteger2, bcxpinteger3)

Added Mob Max HP (MHP) as a variable in the XP formula

Added Player Level (PLVL) as a variable in the XP formula

Added a new command to check on current values of user defined integers (bcxpintvalue)

Added an initial set up that runs only once when a player first enters a new world to accommodate the new expanded formula

Fixed a bug that prevented XP numbers 80+ from appearing