Use protobufs for packed message data #309

Job	Run time
Build Examples	3m 52s
Build Offline Docs	40s
PhotonClient Build	39s
Gradle Build	4m 15s
Photonlib - Build Docker - Athena	6m 32s
Photonlib - Build Host - Win64	4m 54s
Photonlib - Build Docker - Raspbian	6m 42s
Photonlib - Build Host - macOS	5m 19s
Photonlib - Build Docker - Aarch64	6m 45s
Photonlib - Build Host - Linux	3m 55s
Build fat JAR - Win64	2m 25s
Build fat JAR - macOS	3m 40s
Build fat JAR - Linux	2m 27s
Build fat JAR - macOSArm	2m 54s
Build fat JAR - LinuxArm32	1m 52s
Build fat JAR - LinuxArm64	2m 19s
Build image - ${{ matrix.image_url }}	0s
release	0s
	59m 10s

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