Use protobufs for packed message data #274

Job	Run time
Build Examples	2m 36s
Gradle Build	2m 2s
Build Offline Docs	1m 17s
PhotonClient Build	45s
Photonlib - Build Docker - Athena	2m 51s
Photonlib - Build Host - Win64	7m 8s
Photonlib - Build Docker - Raspbian	2m 2s
Photonlib - Build Host - macOS	5m 16s
Photonlib - Build Docker - Aarch64	2m 53s
Photonlib - Build Host - Linux	2m 57s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	29m 47s

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