White Mage: Implement Stat Boost Spells

Implemented the Stat Boost Spells These were easy and well documented on BGWiki

Formula: Boost Spell Potency = floor( (Enhancing Magic Skill - 300)÷10 ) + 5

Source:
http://wiki.bluegartr.com/bg/Category:Boost_Spell
http://wiki.bluegartr.com/bg/Boost-STR
http://wiki.bluegartr.com/bg/Boost-DEX
http://wiki.bluegartr.com/bg/Boost-VIT
http://wiki.bluegartr.com/bg/Boost-AGI
http://wiki.bluegartr.com/bg/Boost-INT
http://wiki.bluegartr.com/bg/Boost-MND
http://wiki.bluegartr.com/bg/Boost-CHR