Use protobufs for packed message data #278

Job	Run time
Build Offline Docs	51s
PhotonClient Build	44s
Build Examples	3m 37s
Gradle Build	5m 17s
Photonlib - Build Docker - Athena	6m 53s
Photonlib - Build Host - Win64	4m 55s
Photonlib - Build Docker - Raspbian	2m 10s
Photonlib - Build Host - macOS	4m 7s
Photonlib - Build Docker - Aarch64	2m 22s
Photonlib - Build Host - Linux	4m 10s
Build fat JAR - Win64	3m 22s
Build fat JAR - macOS	2m 45s
Build fat JAR - Linux	1m 44s
Build fat JAR - macOSArm	6m 30s
Build fat JAR - LinuxArm32	2m 32s
Build fat JAR - LinuxArm64	1m 33s
Build image - ${{ matrix.image_url }}	0s
release	0s
	53m 32s

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