Print version number of device 1 on each raw dev.

Only works on HID++ >=2.0 so far. Also solves a race condition where
the wrong response can be sent to a request.

src/logid/backend/hidpp20/features/Root.cpp

@@ -0,0 +1,25 @@
+#include "Root.h"
+
+using namespace logid::backend::hidpp20;
+
+Root::Root(Device* dev) : Feature(dev, ID)
+{
+
+}
+
+feature_info Root::getFeature(uint16_t feature_id)
+{
+    feature_info info;
+    std::vector<uint8_t> params(2);
+    params[0] = feature_id & 0xff;
+    params[1] = (feature_id >> 8) & 0xff;
+
+    auto response = this->callFunction(Function::Ping, params);
+
+    info.feature_id = response[0];
+    info.hidden = response[1] & FeatureFlag::Hidden;
+    info.obsolete = response[1] & FeatureFlag::Obsolete;
+    info.internal = response[1] & FeatureFlag::Internal;
+
+    return info;
+}