Detect non-connected devices in QueryDevice

If the SDK returns the ERROR_DEVICE_NOT_CONNECTED error when calling
the QueryDevice API, do not throw a NativeCallException but instead
detect this error and return a device info struct where the connected
count is set to zero.

A new enum member "Unknown" is added to the DeviceType enumeration
to cover this use case.

Fixes #284.

src/Colore/Data/DeviceType.cs

@@ -38,6 +38,13 @@ namespace Colore.Data
     [JsonConverter(typeof(StringEnumConverter))]
     public enum DeviceType
     {
+        /// <summary>
+        /// Unknown device.
+        /// </summary>
+        [PublicAPI]
+        [EnumMember(Value = "unknown")]
+        Unknown = 0,
+
         /// <summary>
         /// A keyboard device.
         /// </summary>

src/Colore/Data/Result.cs

@@ -46,6 +46,12 @@ namespace Colore.Data
     [JsonConverter(typeof(ResultConverter))]
     public struct Result : IEquatable<int>, IEquatable<Result>
     {
+        /// <summary>
+        /// The device is not connected.
+        /// </summary>
+        [PublicAPI]
+        public static readonly Result DeviceNotConnected = 1167;
+
         /// <summary>
         /// Access denied.
         /// </summary>
@@ -106,6 +112,7 @@ public struct Result : IEquatable<int>, IEquatable<Result>
         private static readonly Dictionary<Result, KeyValuePair<string, string>> Mappings =
             new Dictionary<Result, KeyValuePair<string, string>>
             {
+                { 1167, new KeyValuePair<string, string>(nameof(DeviceNotConnected), "The device is not connected.") },
                 { 5, new KeyValuePair<string, string>(nameof(RzAccessDenied), "Access denied.") },
                 { unchecked(-2147467259), new KeyValuePair<string, string>(nameof(RzFailed), "General failure.") },
                 { -1, new KeyValuePair<string, string>(nameof(RzInvalid), "Invalid.") },

src/Colore/Native/NativeApi.cs

@@ -105,7 +105,14 @@ public Task<SdkDeviceInfo> QueryDeviceAsync(Guid deviceId)
                 var result = _nativeSdkMethods.QueryDevice(deviceId, ptr);
 
                 if (!result)
+                {
+                    if (result == Result.DeviceNotConnected)
+                    {
+                        return Task.FromResult(new SdkDeviceInfo(DeviceType.Unknown, 0));
+                    }
+
                     throw new NativeCallException("QueryDevice", result);
+                }
 
                 if (ptr == IntPtr.Zero)
                     throw new ColoreException("Device query failed, ptr NULL.");