Add FastPlayerListPacket

[Encritary]

Description

Fix PlayerListPacket bug in Nemisys.



### Reason to modify



I just replaces original PlayerListPacket with FastPlayerListPacket :3

### Tests & Reviews











There is only replaces MCPE packet with Synapse identical, I think it doesn't need a lot of tests.

[Encritary]

@dktapps @PeratX

[ishitatsuyuki]

Have you tested this? I and Dylan don't use Nemisys and are reluctant to setup it for test.

[dktapps]

Seems a slight lack of activity from the people responsible for this project. Please be patient. I know next to nothing about Nemisys, I don't use it and it's not my field.

[Encritary]

@PeratX and @boybook knows

[Yoyu666]

what is this do?

[tarik02]

@Yoyu666, this fixes client freeze when playing though SPP and click back button.

[PeratX]

Looks good. +1

[ishitatsuyuki]

PeratX, filling a slot for you. Merge at your risk.

[PeratX]

What do you mean.

[dktapps]

A supplementary (untested) plus-one I think he means.

[PeratX]

Tested. Working.

[dktapps]

What happened to the PR formatting? Dear God. Well, whatever.

[SleepSpace9]

I got an error (server crash) on login now:

[15:44:23] [Server thread/INFO]: PillePalle[/x.x.x.x:23456] [ClientID: -9125418660827245104] logged in with entity id 1 at (Lobby, 17.5207, 5.4, -26.1701)

Notice: Undefined variable: sendTo in phar:///usr/games/pocketmine-lobby/Genisys_1.2dev.phar/src/synapse/network/protocol/spp/FastPlayerListPacket.php on line 29
[15:44:24] [Server thread/CRITICAL]: TypeError: "Argument 1 passed to pocketmine\utils\BinaryStream::putUUID() must be an instance of pocketmine\utils\UUID, null given, called in phar:///usr/games/pocketmine-lobby/Genisys_1.2dev.phar/src/synapse/network/protocol/spp/FastPlayerListPacket.php on line 29" (EXCEPTION) in "/src/pocketmine/utils/BinaryStream" at line 182
[15:44:24] [Server thread/EMERGENCY]: An unrecoverable error has occurred and the server has crashed. Creating a crash dump
[15:44:24] [Server thread/EMERGENCY]: Please upload the "/usr/games/pocketmine-lobby/crashdumps/CrashDump_Sat_Aug_20-15.44.24-CEST_2016.log" file to the Crash Archive and submit the link to the Bug Reporting page. Give as much info as you can.
[15:44:24] [Server thread/INFO]: Disabling SimpleAuth v1.7.1
...

[dktapps]

@SleepSpace9 Please open a separate issue and reference this PR.