add operation processing for text state operations, support for matrix multiplication with tests and td operation support

src/UglyToad.Pdf/Graphics/Operations/TextState/SetWordSpacing.cs

@@ -1,5 +1,7 @@
 namespace UglyToad.Pdf.Graphics.Operations.TextState
 {
+    using Content;
+
     internal class SetWordSpacing : IGraphicsStateOperation
     {
         public const string Symbol = "Tw";
@@ -13,6 +15,13 @@
             Spacing = spacing;
         }
 
+        public void Run(IOperationContext operationContext, IResourceStore resourceStore)
+        {
+            var currentState = operationContext.GetCurrentState();
+
+            currentState.FontState.WordSpacing = Spacing;
+        }
+
         public override string ToString()
         {
             return $"{Spacing} {Symbol}";