Add in calculated value changes to display screen

[casusscribere]

Many talents/traits/mods/ammo/attributes modify various weapon stats. Right now this is handled in the weapon API calls, but I'd like to move this to be handled in the character sheet and displayed on the View screen (ex: melee wpn dmg displays with the + from strength mod on the display screen). The API scripts will be changed to either (a) accept pre-calculated values and not modify them unnecessarily or (b) do the calculation work the way they do now.