TNT Spawns Pickups

Fixes FS#397.
ByteBuffer: Writing a string doesn't modify it (missing const).
APIDump: Fixed HOOK_LOGIN short desc.
Protocol 1.7: Added skeleton functions for reading client packets.

Untested, this is skeleton code only.
Merge branch 'griefer'sdelight' of git://github.com/tigerw/MCServer.
Merge branch 'master' of https://github.com/mc-server/MCServer