pkg/littlefs: bump version to v1.6.2

sys/ecc: add repetition code

lorabox: add port to flasher parameters

sys/ecc: add golay(24,12) half rate code

pkg/semtech-loramac: Reduce timeout in timer

pkg/nimble: use STACKTEST flag for controller thread

tests/lwip_sock_{i,ud}p: correctly get array address

tests/lwip_sock_*: Stop main thread from overflowing

 nrf5x_common: gpio: fix port 1 functionality 

This adds the port parameter to the stm32loader flash script. This was
necessary to allow flashing on macOS X where the default port is not
autodetected correctly and needs to be specified, e.g. by running:

    BOARD=lobaro-lorabox PORT=/dev/tty.SLAB_USBtoUART \
    make -C examples/lorawan flash term`

net/rdcli*: restructure and rename RD related modules

We want the address of the start of the array.

tests/arduino: add automatic test for arduino module

pkg/openthread: rework of FTD and MTD support

lwip: Bump version to v2.1.0

drivers/adxl345: fix ADXL345 driver

drivers/periph_eeprom: refactor implementation and test application

core/bitarithm: change types to `uintXX_t`