Ported .Net Core commits:

hondacrx:
- Initial commit: Switch to .Net Core 2.0
- Fix build and removed not needed files
Fabi:
- Updated solution platforms.
- Changed folder structure.
- Change library target framework to netstandard2.0.
- Updated solution platforms again...
- Removed windows specific kernel32 function usage (Ctrl-C handler).

Source/Game/Groups/GroupReference.cs

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2012-2017 CypherCore <http://github.com/CypherCore>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using Framework.Dynamic;
+using Game.Entities;
+
+namespace Game.Groups
+{
+    public class GroupReference : Reference<Group, Player>
+    {
+        public GroupReference()
+        {
+            iSubGroup = 0;
+        }
+
+        ~GroupReference() { unlink(); }
+
+        public override void targetObjectBuildLink()
+        {
+            getTarget().LinkMember(this);
+        }
+
+        public new GroupReference next() { return (GroupReference)base.next(); }
+
+        public byte getSubGroup() { return iSubGroup; }
+
+        public void setSubGroup(byte pSubGroup) { iSubGroup = pSubGroup; }
+
+        byte iSubGroup;
+    }
+
+    public class GroupRefManager : RefManager<Group, Player>
+    {
+        public new GroupReference getFirst() { return (GroupReference)base.getFirst(); }
+    }
+}