Comment clean-up

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Comment improvements

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Progress on Transmission:
- Refactored interaction between Transmission & Payload:
   - writing/reading of payload type and payload data bits to construct transmission body is not entirely handled by Transmission#send() and #receive()
   - in addition the tranmission body now also contains a field indicating the bit length of the payload data, this is written by Transmission#send() and read+verified by #receive()
   - Payload#serialise() and #deserialise() now only handle some errors checks and bitstream/array setup
- clean-ups, readability and documentation improvements in TextSMSTransmission, TextMessage, BinarySMSTransmission & BinaryMessage
* Next TODO: finalise RecordsPayload (format is still incomplete and we need a less wasteful way of "testing" whether a new record fits, all the way to a simulated transmission sending)

General:
- dropped "get" from the name of getter methods on IntegerRangeMapping (for brevity and because it is less expected on this kind of class)

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>