Db refactoring

Re-organize the whole DB folder and more:
- Add sub folder in the DB to get a better structure.
- Introduce some kind of new DB files to store items and skills informations.
- Fix 2nd and 3rd job attack animation key (and render weapon).
- Add babies job (and size).
- Modify how entity.xSize/ySize was working.
- Remove unused code to load lua byte file.
- Refactoring items code (see: DB.getItemName, EquipmentLocation.js and ItemType.js).
- Add new tools folder with a converter and a new user-friendly compiler.