LightDescription missing hardware_number for VisualPinball.Engine platform

[jsm174]

While working on dependency updates for VisualPinball.Engine.Mpf, we noticed an exception while parsing lights when a user presses Get Machine Description.

Coils and switches currently have a number node. Lights seem to be missing a number node:

mpf/mpf/platforms/visual_pinball_engine/protobuf/platform.proto

Lines 20 to 35 in 97efc55

	message SwitchDescription {
	string name = 1;
	string hardware_number = 2;
	string switch_type = 3; // NO or NC
	}
	message CoilDescription {
	string name = 1;
	string hardware_number = 2;
	}
	message LightDescription {
	string name = 1;
	string hardware_channel_number = 2;
	string hardware_channel_color = 3;
	}

Other examples in the repo reference number for lights as well:

mpf/mpf/benchmarks/machine_files/shows/config/config.yaml

Lines 1 to 11 in 56dcfb9

	#config_version=5
	lights:
	light_1:
	number: 1
	tags: playfield, light_group_1
	light_2:
	number: 2
	tags: playfield, light_group_1
	light_3:
	number: 3
	tags: playfield, light_group_1

[jsm174]

Hello again. We are about to release a new version of VisualPinball.Engine.Mpf.
@jabdoa2 - Any thoughts on this issue?

[jabdoa2]

Sorry I missed it. I can try to add something this weekend.