Moving these headers from src to include enables other libraries to use the
functionality provided.
* tcpsockets
* atomic_static
* raw_istream
* timestamp
* SafeThread
* Base64
* LEB128
* ConcurrentQueue
The classes have been moved into the wpi namespace as they're generic.
This is safe because of the way writes are performed: for each transmission,
all outgoing messages are concatenated in memory and only a single write()
syscall is made.
