Layout
======

| module group | can import   | main purpose                           |
|:-------------|:------------:|:--------------------------------------:|
| Core         |              | common datatypes                       |
| DHT          |  Core        | centralized peer discovery             |
| Tracker      |  Core        | decentralized peer discovery           |
| Exchange     |  Core        | torrent content exchange               |
| Client       | any other    | core of bittorrent client application  |