ahShop 2 (npc shop system) (updated)

Changes to the new version:

1. Optimized the code again, reduced amount of code again.
2. Added new options, so you now can sell: Pointshop 1, Pointshop 2 points, gLevel XP & Simple Stamina.
3. Added a system, that allows maximum purchase amount of the entities. (separate amount)
4. Added a new config option, for the maximum entity amount (per entity)
5. Removed two values called Health and armor in the config, they are now merged in to the value: Amount.
6. Added some new API functions, that will be used adding more gamemode support later on.
7. Redid some code, to prepare it for Ahshop3 version.
8. Added a food entity base, not in working state yet, preparing to add darkrp food support.

Note: You have to update your config file again.