periph_common: Call hwrng_init when enabled

github: add Code of Conduct

Handled by periph_init now.

Handled by periph_init now.

gnrc_netapi: make doc a little more consistent

Throughout the documentation `gnrc_nettype_t` is referred to as a
"protocol type". The documentation for the functions
`gnrc_netapi_dispatch_*()` that were added later only refer to it as
"type".

This fix changes those to "protocol type" to make this clearer in the
context of these functions and unify it with the rest of the
documentation.

dist: add commit message length checker

gnrc_netif: Fix compile errors when debug is enabled

gnrc_ipv6: fix packet snip switch-up

drivers: restore alphabetical order in Makefile.dep

bluepill: add i2c support

The only difference is that we changed the pins used by I2C_0.

tests: fix python E127 'continuation line over/under-indented for visual indent'

tests/lwip: fix python E711 comparison to None should be 'if cond is not None:'

tests/evtimer_msg: fix F841 local variable 'stop' is assigned to but never used

periph/flashpage: add flashpage_write_raw interface

ci: murdock: Replace hardcoded path by bindir variable

sys: net: add nanocoap

ci: murdock: fix output error on missing builddir after failed build

tests: set APPLICATION from folder name

drivers/kw2xrf: fix fall through