Use protobufs for packed message data #56

Job	Run time
Gradle Build	3m 11s
Build Examples	3m 43s
PhotonClient Build	1m 13s
Build Offline Docs	1m 14s
Photonlib - Build Docker - Athena	5m 5s
Photonlib - Build Host - Win64	6m 40s
Photonlib - Build Host - Linux	3m 10s
Photonlib - Build Docker - Raspbian	5m 20s
Photonlib - Build Docker - Aarch64	5m 42s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	35m 18s

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