Container and array data types

PR Breakdown
============

Issue
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There are currently is 14 different "array" data types in the types version. Every time a minecraft updates adds a new "type" of/ array, we are forced to create a three new functions, one new type, etc...
This has led to the packet definition being unclear (What is a mapChunkBulk ? What is a statistic array ?) and the source of protocol.js to be ridiculously big.

Proposed Fix
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We should replace the different data types with a simple and flexible system. 

Every types can have access to "typeArgs", which can define some options that are only given for that data type. 

The following four data types : 
- container, pretty much defines a javascript object. Takes a "fields" array in it's typeArgs.
- count, a hack that uses an array/buffer as its value instead of the given one. Takes a "type" and a "countFor" string in its typeArgs
- array, represents a length-prefixed array. Takes a "type" and a "count" string in its typeArgs.
- buffer, a specialized array for "bytes" that return a nodejs Buffer, instead of a js array. Takes a "count" string in its typeArgs

All of those can be nested, which allows for nearly every complex data types to be broken down into simpler ones. 

Examples : 

```javascript
   map_chunk_bulk:     {id: 0x26, fields: [
        { name: "chunkColumnCount", type: "count", typeArgs: { type: "short", countFor: "meta" } },
        { name: "dataLength", type: "count", typeArgs: { type: "int", countFor: "compressedChunkData" } },
        { name: "skyLightSent", type: "bool" },
        { name: "compressedChunkData", type: "buffer", typeArgs: { count: "dataLength" } },
        { name: "meta", type: "array", typeArgs: { count: "chunkColumnCount", 
          type: "container", typeArgs: { fields: [
            { name: "x", type: "int" },
            { name: "z", type: "int" },
            { name: "bitMap", type: "ushort" },
            { name: "addBitMap", type: "ushort" }
        ] } } }
      ]},
```

Note : needs to be extensively tested with an actual server. All tests currently pass, but I didn't really test on minecraft server.