Added the Vending Module. First version.

vending=>index:
This page lists all the registered shops in database. It shows their position, title, charname, etc. By clicking on it, it opens a page to the item shop list.

vending=>viewshop:
This page list all the items on sale by a specific shop. it shows all the necessary attributes (refine, cards, slots, amount, price, etc).

TODO:
- Search for one item, and returns all the shops who sell it. (or all the similar items). That would be reaallly useful.  <== This is very important. /!\
- Order the item list.  <== This is not so important.
- Display all items of all shops in one page, with the possibility to order them. <== This is not so important.
Merge branch 'master' of https://github.com/Akkarinage/FluxCP