Another option for Ws2812 - direct spi from the pi with 1 wire (#631)

* Removed -HUP so the default -TERM signal is sent instead.
- hyperiond only listens for TERM and INT. HUP is often used to get an exe to reread its config

Changed pgrep to add '-x' so it wont partial match on the exe name.
- I have multiple instances with multiple hyperiond-instance1 names
- this ensures the service script only kills the right process

* reversing errant change to hyperion.systemd.sh

* This add a new device type - ws2812spi.

I've (ab)used the SPI interface to send the correct timing pulses to keep the ws2812 happy.
THE RATE IS IMPORTANT!
A FIXED CORE_CLK IS IMPORTANT!

Attach the SPI MOSI pin on the Pi to the DIN pin on your ws2812

        "device" :
        {
                "name"       : "MyPi",
                "type"       : "ws2812spi",
                "colorOrder" : "grb",
                "output"     : "/dev/spidev0.0",
                "rate"       : 3800000
        },

* updated hyperiond.test-binary

* Updated default SPI speed to the "correct" value.
My Pi was undervolted so was dropping the core clock confusing everything

* Code cleanups
explicitly set the final 3 bytes to 0

* Removed latchtime option - not applicable

* updated test binary


Former-commit-id: d3c19c8374999f7a554bb25ca181a8a483f86289

libsrc/leddevice/CMakeLists.txt

@@ -75,6 +75,7 @@ if(ENABLE_SPIDEV)
 			${CURRENT_SOURCE_DIR}/LedDeviceLpd8806.h
 			${CURRENT_SOURCE_DIR}/LedDeviceP9813.h
 			${CURRENT_SOURCE_DIR}/LedDeviceWs2801.h
+			${CURRENT_SOURCE_DIR}/LedDeviceWs2812SPI.h
 			${CURRENT_SOURCE_DIR}/LedDeviceAPA102.h
 	)
 	SET(Leddevice_SOURCES
@@ -84,6 +85,7 @@ if(ENABLE_SPIDEV)
 			${CURRENT_SOURCE_DIR}/LedDeviceLpd8806.cpp
 			${CURRENT_SOURCE_DIR}/LedDeviceP9813.cpp
 			${CURRENT_SOURCE_DIR}/LedDeviceWs2801.cpp
+			${CURRENT_SOURCE_DIR}/LedDeviceWs2812SPI.cpp
 			${CURRENT_SOURCE_DIR}/LedDeviceAPA102.cpp
 	)
 endif(ENABLE_SPIDEV)