gnrc_icmpv6: Clean up redundant conditional debug statement

sdcard_spi: integrate to mtd interface

net/gcoap: renamed source folder s/coap/gcoap/

net/gcoap: add Uri-Query strings for requests

net/gcoap: expose creation of resource list to API

Creating the resource list is useful outside the /.well-known/core
handler, e.g. for the registration to resource directories.

make: allow for disabling colored compiler output

stm32_common/periph/rtc: fix wrong read order of rtc regs

stm32_common/periph/rtc: fix wrong read order of rtc regs, add wait for calender sync to rtc_set_time

k60: Update to latest vendor headers

kinetis: update vendor headers

core: remove redundant includes

kinetis: Remove unused configuration items

stm32f1: rtt: declare functions static

kinetis: Unify cpu.c, update clock initialization code

Unify cpu_init for all Kinetis CPUs to reduce code duplication.
Updated the MCG driver implementation to make the configuration easier.
Most clock settings are initialized by kinetis_mcg_init() called from
cpu_init. Board specific external clock source initialization
(FRDM-K64F, PhyNode) needs to be performed in board_init instead of
in cpu_init.

cpu: add and use shared code for timer_set()

Some KW series CPUs have no OSC module, but uses the oscillator found in
the built-in transceiver.

net/gcoap: added remote sock ep to resp handler cb

When receiving a response to a request send our earlier, it is in
some cases essential, to know something about who send the reponse.
This is needed for example when sending requests to multicast
addresses to be able to react to different incoming responses.

kinetis: Update Doxygen