Corrected deserializedItemStack implementation, custom logging ...

[Qveshn]

1. Workaround with packets without player (player==null)
2. Workaround with deserializedItemStack from ProtocolLib (function was rewritten from ProtocolLib)
3. Exceptions wais divided in two groups:
   ExploitException - when to kick player
   Throwable - other exceptions which means internal plugin errors. Plugin only cancels event here. These errors should be corrected if they appear.
4. Custom logging of players that exploits packets has been added. Log file is in player folder, and holds not only players who exploit packet,
   but also info about ItemStack with NbtCompound tags as json
5. Two options were added to config.yml: EnableCustomLog and CustomLogFormat
6. There was "magic" phrase added to the code ("CustomPayloadFixer" on first page). This allows admins to test how plugin works.
7. Plugin version was change to "1.5.1 X". DO NOT FORGET TO RENAME AFTER MERGE.

ToDo: There is no yet custom logging in bungee part, but it is easy to implement by analogy with bukkit part.