[mr3296] Improve use WorldPackets
* Send only written data
* Reuse packets storage in loops and update packet compressing
[mr3297] Weather updates are now sent to all players in the zone instead of the first player it finds in the zone and all players nearby

Ported from TC, author Discover
[mr3298] Make possible use more 254 world states (needed for WG)
[mr3299] Clarify and use some spell attributes