Stats rework and Level Progression

Updated the stats system to include derived stats. 

Current Base stats and what they effect:

• STR:  Strength affects Melee attack power.
• DEX:  Melee Crit Chance and Ranged/Melee Attack.
• INT:  Spell Crit chance and Spell Damage. Spell resistance
•  WIS:  Spell crit chance and Spell Damage. Spell resistance.
• CON:  Con increases HP, physical attack reduction
• CHA:  Barter and reward increases

When you start a fresh save file each hero starts currently with 18 upgrade points. It takes 2 points to upgrade a stat(it's actually 3 because of a bug but will be 2). Each level up grants 1 point, every other level grants 2. 1,2,1,2,1,2,1,2 etc...