ll: New timer organization. LL now uses 2 generic timers (1 repeated and 1 single shot) for the different LL states
ll: consistency of LL state names
ll: Implementation of passive scanning
examples: Add LL Scanner example
ll: Fix formatting
examples/ll-scanner: Fix formatting
Allow custom specification of the toolchain path

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Fix Makefile.config include path in example's Makefile

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Allow specification of the path to JlinkExe

This needs updated version of nrftool which add --jlinkexe option.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Allow specification of the programmer command

This change should allow easy change to for example 'nrftool --verbose' in my
custom Makefile.config.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
ll: Modify interval parameter to uint32_t
bci: Modify interval parameter to uint32_t
timer: Change timer_start() API from ms to us

In several places we need to have timers with microsecond resolution.
This patch modifies the timer_start() API to accept us, adds helper
macros TIMER_MILLIS() and TIMER_SECONDS(), and updates all examples.
nrf51822/radio: Clear rxshort after use it
nrf51822/radio: Add RX option to radio_reply()
nrf51822/log: Parametrize buffer length
examples: Add radio-active-observer example
nrf51822/radio: Comment ref for radio mode
nrf51822/radio: Set time interval between two packets to 150 us