Sacn

Functionality related to sending of sACN data is now mostly covered by tests. Removed undocumented parameters for `sACNsender.start()`.

Test coverage for functionality related to receiving sACN data is now mostly covered by tests.
Fixed a bug, where an exception was thrown on the first `DataPacket` when the stream-termination option was set.

(Additional thanks to mthespian ! See 31 for more information)

Test coverage of sub-module `messages` is now 100%.

* Fixed a bug where a too long source name did not throw an exception.
* Fixed a bug where invalid DMX data could be set on the `DataPacket`.

(Thanks to mthespian! See 30 for more information)

Fixed a bug, where the DMX start code was not set on received packets (Thanks to mthespian ! See 29 for more information).

Thanks to mthespian, data packets now support the DMX start code present in DMX data. Previously, this code was limited to being `0x00`.

See 27 for more information.

Due to a debugging statement, the sending and receiving hot paths were slower than necessary. The debugging statements were removed and the performance improved.

Note that this means the logging output will now be different (missing messages when a packet was send or received).

See 25 for more information and thanks to shauneccles !