update protocol packet definitions: replace value receivers with pointer receivers in PacketID methods, expand FixedBitSet size from 8 to 256 bits, and remove outdated documentation files

pkg/protocol/packet/game/server/move_player_pos_rot.go

@@ -9,7 +9,7 @@ type MovePlayerPosRot struct {
 	Flags       int8
 }
 
-func (MovePlayerPosRot) PacketID() packetid.ServerboundPacketID {
+func (*MovePlayerPosRot) PacketID() packetid.ServerboundPacketID {
 	return packetid.ServerboundMovePlayerPosRot
 }