Add support casting System.Drawing.Color to Discord.Color

commit fa33034267
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sun Apr 29 13:50:56 2018 +0900

    Use built-in symbol

    refs: https://github.com/RogueException/Discord.Net/pull/1043#issuecomment-385223999

commit 27ea826685
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sun Apr 29 11:29:31 2018 +0900

    Add support casting System.Drawing.Color to Discord.Color

commit 1ab9de2497
Merge: f5bb99c7 a4d1e2bc
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sun Apr 29 10:16:46 2018 +0900

    Merge remote-tracking branch 'upstream/dev' into dev

commit f5bb99c77d
Merge: 3be8e40d b8b59d97
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Tue Apr 10 11:07:36 2018 +0900

    Merge remote-tracking branch 'upstream/dev' into dev

commit 3be8e40d38
Merge: c692306f 9d77a3cd
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sun Jan 7 15:05:31 2018 +0900

    Merge remote-tracking branch 'upstream/dev' into dev

commit c692306fcc
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sat Nov 11 10:49:00 2017 +0900

    Add target of the internal fields

commit 2d08f9a655
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sat Nov 11 10:17:42 2017 +0900

    Add some more extension

commit 4f19b835ff
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sat Nov 11 01:19:11 2017 +0900

    Add naming rules

commit af756cd9fe
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Sat Nov 11 00:35:30 2017 +0900

    Add basic .NET style rules

commit 503ece558b
Author: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Date:   Fri Nov 10 22:36:52 2017 +0900

    Add EditorConfig

src/Discord.Net.Core/Discord.Net.Core.csproj

@@ -4,8 +4,8 @@
     <AssemblyName>Discord.Net.Core</AssemblyName>
     <RootNamespace>Discord</RootNamespace>
     <Description>The core components for the Discord.Net library.</Description>
-    <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net45;netstandard1.1;netstandard1.3</TargetFrameworks>
-    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.1;netstandard1.3</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net45;netstandard1.1;netstandard1.3;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.1;netstandard1.3;netstandard2.0</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="10.0.2" />

src/Discord.Net.Core/Entities/Roles/Color.cs

@@ -1,5 +1,8 @@
 using System;
 using System.Diagnostics;
+#if NETSTANDARD2_0 || NET45
+using StandardColor = System.Drawing.Color;
+#endif
 
 namespace Discord
 {
@@ -96,7 +99,14 @@ namespace Discord
                 ((uint)(g * 255.0f) << 8) |
                 (uint)(b * 255.0f);
         }
-        
+
+#if NETSTANDARD2_0 || NET45
+        public static implicit operator StandardColor(Color color) =>
+            StandardColor.FromArgb((int)color.RawValue);
+        public static explicit operator Color(StandardColor color) =>
+            new Color((uint)color.ToArgb() << 8 >> 8);
+#endif
+
         public override string ToString() =>
             $"#{Convert.ToString(RawValue, 16)}";
         private string DebuggerDisplay =>