OPNSense/tools 9dcd73ebuild arm.sh common.sh, config/19.1 ports.conf plugins.conf

Add cross build support for aarch64 and RPI3 config (#120)

DeltaFile
+129-129config/19.1/ports.conf
+42-42config/19.1/plugins.conf
+36-0config/19.1/SMP-RPI3
+9-4build/arm.sh
+10-0device/rpi3.conf
+8-1build/common.sh
+3-1device/rpi2.conf
+2-0device/bpi.conf
+239-1778 files

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