Use protobufs for packed message data #261

Job	Run time
Build Offline Docs	1m 13s
PhotonClient Build	44s
Build Examples	2m 37s
Gradle Build	1m 57s
Photonlib - Build Docker - Athena	2m 58s
Photonlib - Build Host - Win64	4m 34s
Photonlib - Build Docker - Raspbian	2m 10s
Photonlib - Build Host - macOS	2m 27s
Photonlib - Build Docker - Aarch64	2m 52s
Photonlib - Build Host - Linux	2m 13s
Build fat JAR - ${{ matrix.artifact-name }}	0s
Build image - ${{ matrix.image_url }}	0s
release	0s
	23m 45s

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