Use protobufs for packed message data #281

Job	Run time
Build Offline Docs	51s
Build Examples	2m 4s
Gradle Build	1m 5s
PhotonClient Build	53s
Photonlib - Build Docker - Athena	4m 27s
Photonlib - Build Host - Win64	6m 30s
Photonlib - Build Docker - Raspbian	5m 0s
Photonlib - Build Host - macOS	3m 38s
Photonlib - Build Docker - Aarch64	4m 39s
Photonlib - Build Host - Linux	5m 51s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	34m 58s

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