Lg1: Implement both light|darkAmbience stimBuffs & their production

We now produce both light and dark ambience stimframes into
stimbuffs for the LivoxGen1 lidar devices.

stimBuffApis/livoxGen1/livoxGen1.cpp

@@ -513,7 +513,8 @@ static const StimBuffApiDesc livoxGen1ApiDesc = {
 	.exportedQualeIfaceApis = {
 		{.name = "mesh"},
 		{.name = "pcloudIntensity"},
-		{.name = "pcloudAmbience"},
+		{.name = "pcloudLightAmbience"},
+		{.name = "pcloudDarkAmbience"},
 		{.name = "gyro"},
 		{.name = "accel"}
 	},
@@ -662,7 +663,8 @@ extern "C" void livoxGen1_attachDeviceReq(
 		// Unknown qualeIfaceApi
 		std::cerr << __func__ << ": Unsupported qualeIfaceApi '"
 			<< qualeIfaceApi << "' for LivoxGen1. "
-			"Supported values: mesh, pcloudIntensity, pcloudAmbience"
+			"Supported values: mesh, pcloudIntensity, "
+			"pcloudLightAmbience, pcloudDarkAmbience"
 			<< std::endl;
 		cb.callbackFn(false, desc);
 		return;