v2.9.9

- Added Class-B support, as defined in LoRaWAN v1.1
- Added downlink "just-in-time" scheduling to optimize downlink capacity
- Merged all different flavours of packet forwarder into one unique lora_pkt_fwd
- Updated Gateway <-> NetworkServer protocol ti describe the new format of "time" field.

** WARNING **
** This version is an experimental release for Class-B support.

** KNOWN LIMITATIONS/BUGS **
** - Not compatible with iot.semtech.com due to protocol change (see PROTOCOL.txt).
   - Does not support 27dBm design (with FPGA), not yet merged with master branch.
   - The beacon preamble length should be set to 10 instead of 6.
   - The "immediate" mode for downlink is not working anymore.

v1.4.1

- Bugfix: fixed LP-116, fdev parameter parsed incorrectly, making FSK TX fail.
- Bugfix: fixed a platform-dependant minor rounding issue.
- Beta: updated beacon format, partially aligned with latest class B proposal.