Add some smaller stuff

Author: LoneWandererProductions

ExtendedSystemObjects/IntArray.cs

@@ -59,7 +59,7 @@ public IntArray(int size)
         /// <summary>
         ///     Gets the current allocated capacity.
         /// </summary>
-        private int Capacity { get; set; }
+        public int Capacity { get; set; }
 
         /// <inheritdoc />
         /// <summary>

ExtendedSystemObjects/SortedKvStore.cs

@@ -58,6 +58,14 @@ public SortedKvStore(int initialCapacity = 16)
         /// </summary>
         public int Count { get; private set; }
 
+        /// <summary>
+        /// Gets the free capacity.
+        /// </summary>
+        /// <value>
+        /// The free capacity.
+        /// </value>
+        public int FreeCapacity => _keys.Capacity - Count;
+
         /// <summary>
         ///     Gets an enumerable collection of all keys currently in the store.
         /// </summary>