Fixed plugin loading

Moved all office interop types in their own file.

GreenshotOfficePlugin/OfficeInterop/OneNote/OneNotePage.cs

@@ -0,0 +1,43 @@
+/*
+ * Greenshot - a free and open source screenshot tool
+ * Copyright (C) 2007-2020 Thomas Braun, Jens Klingen, Robin Krom
+ * 
+ * For more information see: http://getgreenshot.org/
+ * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
+ * 
+ * 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 1 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/>.
+ */
+
+namespace GreenshotOfficePlugin.OfficeInterop.OneNote {
+	// More details about OneNote: http://msdn.microsoft.com/en-us/magazine/ff796230.aspx
+
+	// See http://msdn.microsoft.com/de-de/library/microsoft.office.interop.word.applicationclass_members%28v=Office.11%29.aspx
+
+    public class OneNotePage {
+		public OneNoteSection Parent { get; set; }
+		public string Name { get; set; }
+		public string ID { get; set; }
+		public bool IsCurrentlyViewed { get; set; }
+		public string DisplayName {
+			get {
+				OneNoteNotebook notebook = Parent.Parent;
+				if(string.IsNullOrEmpty(notebook.Name)) {
+					return $"{Parent.Name} / {Name}";
+				}
+
+                return $"{Parent.Parent.Name} / {Parent.Name} / {Name}";
+            }
+		}
+	}
+}