Retain Body attributes when doing cleanhtml

Fixed detection of isInJail, and implemented isInHospital
Merits, Points api + unlockables implemented

- Moved some stuff around in properties API
- Points (unlockable) API implemented
- Merits used (upgrades) API implementeed
- user.unlockables API imeplemented
- Getting attr('src') of images in pages loaded in background
(getPageSync)