Added {m} tag to broadcast a message to all FungusScripts

This allows you to broadcast a message to all FungusScripts in the
middle of Say story text.

Assets/Fungus/Dialog/Editor/SayEditor.cs

@@ -24,7 +24,8 @@ namespace Fungus
 					"\t{wp}, {wp=0.5} Wait on punctuation\n" +
 					"\t{c} Clear\n" +
 					"\t{s}, {s=60} Writing speed (chars per sec)\n" +
-					"\t{x} Exit";
+					"\t{x} Exit" +
+					"\t{m} Broadcast message";
 			
 			float pixelHeight = EditorStyles.miniLabel.CalcHeight(new GUIContent(tagsText), EditorGUIUtility.currentViewWidth);
 			EditorGUILayout.SelectableLabel(tagsText, EditorStyles.miniLabel, GUILayout.MinHeight(pixelHeight));

Assets/Fungus/Dialog/Scripts/Dialog.cs

@@ -243,6 +243,10 @@ namespace Fungus
 					}
 					
 					yield break;
+
+				case TokenType.Message:
+					FungusScript.BroadcastFungusMessage(token.param);
+					break;
 				}
 
 				// Update text writing

Assets/Fungus/Dialog/Scripts/DialogParser.cs

@@ -20,7 +20,8 @@ namespace Fungus
 		WaitOnPunctuation, 		// wp, wp=0.5
 		Clear, 					// c
 		Speed, 					// s, s=60
-		Exit 					// x
+		Exit, 					// x
+		Message					// m=MessageName
 	}
 	
 	public class Token
@@ -153,6 +154,11 @@ namespace Fungus
 			{
 				type = TokenType.Exit;
 			}
+			else if (tag.StartsWith("m="))
+			{
+				type = TokenType.Message;
+				paramText = tag.Substring(2, tag.Length - 2);
+			}
 			
 			Token token = new Token();
 			token.type = type;