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This functions were using the OUTSET and DIRSET registers instead
of SET and DIR. The xxxSET registers only do something when a "1"
is written to any of their bits, writting a "0" does nothing.

`git clone https://github.com/sandeepmistry/arduino-nRF5.git sandeepmistry/nRF5` => `git clone https://github.com/sandeepmistry/arduino-nRF5.git sandeepmistry-github/nRF5`

for pulseIn, pinMode, digitalWrite, digitalRead, Wire

https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-MDK/Download#infotabs

Priority 1 is reserved by the SoftDevice and shall not be used by application code

Adjust loop count to microsecond computations

Update pin map comments in variant.cpp

Swap microphone (P0.03) with unused pin (P0.23) in the pin map to make it easier to prevent digital pin access to the microphone pin.
(The microphone pin should never be used as a digital output since that could damage the microphone amplifier).
P0.03 is now g_ADigitalPinMap[28]. Since PIN_A0 now points to that entry, and the microphone is only accessed by reading analog pin A0.
This change should be transparent to any existing code.

Fix #355 - Wrong SPI pins defined

Fix #355

Added missing endif that was accidentially removed in commit https://github.com/sandeepmistry/arduino-nRF5/commit/0524008cca0432dba9da0dac5e665bb50ae7cd25#diff-ddd77aecb16ad4a70bea9989e9fd8022 (#339)

fix for "undefined reference to `vtable for HardwareSerial'"

add hackaBLE_v2

[[http://wiki.seeedstudio.com/Arch_Link/]]
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@gmail.com>

Added decaWave DWM1001-DEV board

- GPIO0 and GPIO1 on the DWM1001 are attached to the DW1000 not the
nRF52
- Removed 2 digital pins
- Shifted all the numbering

- Replaced '-' with '_'

Added GPIO pin mapping note to nRF52 DK