add new index-mapping for LED-panels wired in alternating rows
add new index-mapping for LED-panels wired in alternating rows

usefulthink/node-rpi-ws281x-native,beyondscreen/node-rpi-ws281x-native,beyondscreen/node-rpi-ws281x-native,usefulthink/node-rpi-ws281x-native,raspberry-node/node-rpi-ws281x-native,beyondscreen/node-rpi-ws281x-native,raspberry-node/node-rpi-ws281x-native,usefulthink/node-rpi-ws281x-native,raspberry-node/node-rpi-ws281x-native