+ISlnContainer.SetDefaultHandlers - SlnParser now can be initialized …

…without handlers at all.

```
  ISlnContainer sln = new SlnParser(false);
  sln.SlnHandlers.Register(new LMySpec());
  ...

  // to reset and register all default:
  sln.SetDefaultHandlers();
```

also fixed MapTest1 because of new handler from 3b98b5e

MvsSln/Core/ISlnContainer.cs

@@ -41,6 +41,11 @@ public interface ISlnContainer
         /// </summary>
         IDictionary<string, RawText> RawXmlProjects { get; set; }
 
+        /// <summary>
+        /// To reset and register all default handlers.
+        /// </summary>
+        void SetDefaultHandlers();
+
         /// <summary>
         /// Parse of selected .sln file.
         /// </summary>

MvsSln/Core/SlnHandlers/LVisualStudioVersion.cs

@@ -79,6 +79,8 @@ public override bool Positioned(ISvc svc, RawText line)
                 return false;
             }
 
+            LSender.Send(this, $"Found version from header: '{lineType}' = '{version}'", Message.Level.Info);
+
             var h = new SlnHeader(svc.Sln.Header);
             switch(lineType)
             {

MvsSln/Core/SlnParser.cs

@@ -70,6 +70,23 @@ public IDictionary<string, RawText> RawXmlProjects
             set;
         }
 
+        /// <summary>
+        /// To reset and register all default handlers.
+        /// </summary>
+        public void SetDefaultHandlers()
+        {
+            SlnHandlers.Reset();
+
+            SlnHandlers.Register(new LVisualStudioVersion());
+            SlnHandlers.Register(new LProject());
+            SlnHandlers.Register(new LProjectDependencies());
+            SlnHandlers.Register(new LProjectSolutionItems());
+            SlnHandlers.Register(new LProjectConfigurationPlatforms());
+            SlnHandlers.Register(new LSolutionConfigurationPlatforms());
+
+            // TODO: validate CoHandlers ref
+        }
+
         /// <summary>
         /// Parse of selected .sln file.
         /// </summary>
@@ -137,16 +154,12 @@ public ISlnResult Parse(StreamReader reader, SlnItems type)
             return data;
         }
 
-        public SlnParser()
+        /// <param name="defaultHandlers">To register and activate all handlers by default if true.</param>
+        public SlnParser(bool defaultHandlers = true)
         {
-            SlnHandlers.Register(new LVisualStudioVersion());
-            SlnHandlers.Register(new LProject());
-            SlnHandlers.Register(new LProjectDependencies());
-            SlnHandlers.Register(new LProjectSolutionItems());
-            SlnHandlers.Register(new LProjectConfigurationPlatforms());
-            SlnHandlers.Register(new LSolutionConfigurationPlatforms());
-
-            // TODO: validate CoHandlers ref
+            if(defaultHandlers) {
+                SetDefaultHandlers();
+            }
         }
 
         protected void Process(ISvc svc)

MvsSlnTest/SlnTest.cs

@@ -261,7 +261,7 @@ public void MapTest1()
                 var map = sln.Result.Map;
                 Assert.AreEqual(38, map.Count);
 
-                Assert.AreEqual(null, map[0].Handler);
+                Assert.AreEqual(typeof(LVisualStudioVersion), map[0].Handler.GetType());
 
                 Assert.AreEqual(typeof(LProject), map[1].Handler.GetType());
                 Assert.AreEqual(typeof(LProjectDependencies), map[2].Handler.GetType());