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value receivers with pointer receivers in PacketID methods, expand FixedBitSet size from 8 to 256 bits, and remove outdated documentation files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/set_command_minecart.go

@@ -9,7 +9,7 @@ type SetCommandMinecart struct {
 	TrackOutput bool
 }
 
-func (SetCommandMinecart) PacketID() packetid.ServerboundPacketID {
+func (*SetCommandMinecart) PacketID() packetid.ServerboundPacketID {
 	return packetid.ServerboundSetCommandMinecart
 }