New singleton-factories introduced:

New singleton-factories introduced:
- Two new registry-based singleton-factories introduced:
  + The FragmenterFactory produces singleton fragmenter instances
  + The ProducerFactory produces singleton producer instance of different types
- Rewritten the code that Base64 encoding is now transparently implemented
  around the socket_write/read() functions. So all data is now being
  transparently transfered to other peers in Base64 encoding.
- Further renames of the package streamer classes to raw-data streamers
- Minor improvements here and there
- TODOs.txt updated