Change Dynamic classes to use public StringBuilderCache since they're shipped in SS.Client

Author: mythz

src/ServiceStack.Text/Pcl.Dynamic.cs

@@ -168,7 +168,7 @@ internal static string Underscored(string pascalCase)
 
         internal static string Underscored(IEnumerable<char> pascalCase)
         {
-            var sb = StringBuilderThreadStatic.Allocate();
+            var sb = StringBuilderCache.Allocate();
             var i = 0;
             foreach (var c in pascalCase)
             {
@@ -179,7 +179,7 @@ internal static string Underscored(IEnumerable<char> pascalCase)
                 sb.Append(c);
                 i++;
             }
-            return StringBuilderThreadStatic.ReturnAndFree(sb).ToLowerInvariant();
+            return StringBuilderCache.ReturnAndFree(sb).ToLowerInvariant();
         }
     }
 #endif

src/ServiceStack.Text/TypeConstants.cs

@@ -9,6 +9,7 @@ public static class TypeConstants
         public static readonly string[] EmptyStringArray = new string[0];
         public static readonly long[] EmptyLongArray = new long[0];
         public static readonly int[] EmptyIntArray = new int[0];
+        public static readonly char[] EmptyCharArray = new char[0];
         public static readonly bool[] EmptyBoolArray = new bool[0];
         public static readonly byte[] EmptyByteArray = new byte[0];
         public static readonly object[] EmptyObjectArray = new object[0];
@@ -21,6 +22,7 @@ public static class TypeConstants
         public static readonly List<string> EmptyStringList = new List<string>(0);
         public static readonly List<long> EmptyLongList = new List<long>(0);
         public static readonly List<int> EmptyIntList = new List<int>(0);
+        public static readonly List<char> EmptyCharList = new List<char>(0);
         public static readonly List<bool> EmptyBoolList = new List<bool>(0);
         public static readonly List<byte> EmptyByteList = new List<byte>(0);
         public static readonly List<object> EmptyObjectList = new List<object>(0);