network: Bit serialization and deserialization

Some time ago I had to serialize (and deserialize) a bit-oriented protocol, i.e., where all the fields were made of bits, and nothing (!) was byte-aligned, except (of course) the full message.

Citing RFC 1925 (it applies to software as well):

(6) It is easier to move a problem around (for example, by moving the problem to a different part of the overall network architecture) than it is to solve it.

Long story short: two new classes: BitSerializer and BitDeserializer. They act as middle men before and after a serialization and deserialization.

A better solution would be to extend Serialize and Deserialize... but it would have been far more complicated, and probably it would have made them slower.