feat: Adding RemoveRange method to IcdHashSet

ICD.Common.Utils/Collections/IcdHashSet.cs

@@ -3,6 +3,7 @@ using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using ICD.Common.Properties;
+using ICD.Common.Utils.Extensions;
 
 namespace ICD.Common.Utils.Collections
 {
@@ -328,6 +329,18 @@ namespace ICD.Common.Utils.Collections
 			return m_Dict.Remove(item);
 		}
 
+		/// <summary>
+		/// Removes each of the items in the sequence from the collection.
+		/// </summary>
+		/// <param name="items"></param>
+		public void RemoveRange(IEnumerable<T> items)
+		{
+			if (items == null)
+				throw new ArgumentNullException("items");
+
+			m_Dict.RemoveAll(items);
+		}
+
 		#endregion
 
 		#region IEnumerable<T>

ICD.Common.Utils/Extensions/DictionaryExtensions.cs

@@ -19,6 +19,9 @@ namespace ICD.Common.Utils.Extensions
 			if (extends == null)
 				throw new ArgumentNullException("extends");
 
+			if (keys == null)
+				throw new ArgumentNullException("keys");
+
 			foreach (TKey key in keys)
 				extends.Remove(key);
 		}