Working on 0.8.0 compatibility

[Windcatcher]

Progress update:

Shaders...pretty much perfected, just one more thing to verify.

Auto-attack: working, had to copy the generated map files from OpenZone to the server's maps folder.

Player heading: finally got the client correctly understanding the player's heading and correctly sending it to the server.

Merchant: fixed the problem with not being able to close the merchant window. It was because the confirmation opcode is 0000, so the cilent has to not wait for the ack in that case.

Selling items: fixed, had to flip all my nodrop flags in my DB since they're reversed in 0.8.0 vs. 0.5.5. Also had to add a flag to the client so it can tell the difference.

Further tests:

1. Zoning out of the tutorial zone.

2. Zoning between zones.

3. Checking my merchant placements in Lelembeth, because I changed them.

4. GM training.

5. Scribing, memorizing, and casting spells.

6. XP updates.

None of these will take very long, and I'm not going to test grouping because that's not really possible to do by myself.