Created rollbackpack class

The abstract class provides way to customize the rollback features
Setup linkedreplicationinfo class

Will use LRI to do weapon purchasing and perk changing
Switched out calls to mutate with changePerk
Replaced PerkList class with getPerks function
Hooked up pack to LRI on client side
Forgot to fix perk drawing bug in perk select list
Compacted replace into one function
Moved buying and selling weapons to LRI class
Integrated dual weapons into buying and selling
Fixed weight issues with buying duals
Fixed compile warnings