0.9.2-otafix1

Initial release.
HCI_RX_BUF_QUEUE_SIZE increased to 16 from 8. This is necessary for trouble free OTA updates on nRF52 boards, otherwise buffer overflow is likely.
If the firmware that was tranferred by OTA is deemed "invalid" by the bootloader then try reboot back to OTA mode instead of booting to UF2 mode or not booting at all.