thumb tool should allow +1's on words

src/HexManiac.Core/Models/Code/ThumbParser.cs

@@ -999,7 +999,14 @@ namespace HavenSoft.HexManiac.Core.Models.Code {
             // Parse successful! Nothing else to do.
          } else {
             if (line.StartsWith("0x")) line = line.Substring(2);
+            var add = 0;
+            if (line.Contains("+")) {
+               var parts = line.Split("+");
+               if (!int.TryParse(parts[1], out add)) return false;
+               line = parts[0];
+            }
             if (!int.TryParse(line, NumberStyles.HexNumber, CultureInfo.CurrentCulture, out result)) return false;
+            result += add;
          }
          results = new[] {
             (byte)result,

src/HexManiac.Tests/CodeToolTests.cs

@@ -175,5 +175,11 @@ namespace HavenSoft.HexManiac.Tests {
          ThumbScript = "add r3,r3,#6; add r3, #6";
          Assert.Equal(Model.ReadMultiByteValue(0, 2), Model.ReadMultiByteValue(2, 2));
       }
+
+      [Fact]
+      public void Word_PlusOne_Compiles() {
+         ThumbScript = ".word 0x8123456+1";
+         Assert.Equal(0x57, Model[0]);
+      }
    }
 }