Release 0.4

Added a fix for: #1
* Pakcatt won't allow packet to be sent when the src callsign does not match the configured mycall.
* Connections stored in memory can only be created between a Pakcatt and a remote station.
* Incoming nolayer3 type packets are ignored unless the destination callsign matches the configured mycall.
Adjusted the delivery queue to send control frames before content frames.
Fixed KISS frames being incorrectly typed when an errant send sequence number is set.
Improved frame queue handling, making communication over radio more efficient and reliable.
Fixed the handling of the P-Flag / F-Bit. This should add more stability when communicating with older TNCs.
Fixed a crash during the decide of MicE APRS frames.
Improved the handling of incoming connections.
Improved the handling of ACK messages.
Improved the sending of Receive Ready frames.
Improved the handling of requests to re-sync sequence numbers.
Fixed AX.25 tests, avoiding a crash when TNC keep-alives are sent during testing.
Improved the mocked TNC mechanism for testing, adding the ability to specify the number of expected frames.

Release 0.3

This release adds stability fixes to the AX.25 protocol and some usability updates.