Removed some unused fields from ItemProtectionStats, including the whole ApplyForSeconds section
Can now only modify a PoolValue and ValuePerSecond
Can now set PoolValue and ValuePerSecond at the same time, so an item can increase a stat and modify that stat per second at the same time
Might have fixed itemstats not getting marked as dirty if a float field for Health/Mana/Stamina was modified (would explain the changes that keep getting lost)