Add APA102/APA102C/SK9822 support to fadecandy!

README.md

doc/fc_server_config.md

server/CMakeLists.txt

server/Makefile

server/http/js/home.js

server/src/apa102spidevice.cpp

server/src/apa102spidevice.h

server/src/fcserver.cpp

server/src/fcserver.h

server/src/spidevice.cpp

server/src/spidevice.h

...linux_raspberrypi/server_vs2017_linux_raspberrypi.vcxproj

...spberrypi/server_vs2017_linux_raspberrypi.vcxproj.filters