[3.2] C#: Re-work solution build output panel

- Removed item list that displayed multiple build
  configurations launched. Now we only display
  the last build that was launched.
- Display build output next to the issues list.
  Its visibility can be toggled off/on.
  This build output is obtained from the MSBuild
  process rather than the MSBuild logger. As such
  it displays some MSBuild fatal errors that
  previously couldn't be displayed.
- Added a context menu to the issues list with
  the option to copy the issue text.
- Replaced the 'Build Project' button in the panel
  with a popup menu with the options:
  - Build Solution
  - Rebuild Solution
  - Clean Solution
- The bottom panel button was renamed from 'Mono'
  to '.NET' and now display an error/warning icon
  if the last build had issues.

modules/mono/editor/GodotTools/GodotTools.BuildLogger/GodotBuildLogger.cs

@@ -15,14 +15,14 @@ public class GodotBuildLogger : ILogger
         public void Initialize(IEventSource eventSource)
         {
             if (null == Parameters)
-                throw new LoggerException("Log directory was not set.");
+                throw new LoggerException("Log directory parameter not specified.");
 
             var parameters = Parameters.Split(new[] {';'});
 
             string logDir = parameters[0];
 
             if (string.IsNullOrEmpty(logDir))
-                throw new LoggerException("Log directory was not set.");
+                throw new LoggerException("Log directory parameter is empty.");
 
             if (parameters.Length > 1)
                 throw new LoggerException("Too many parameters passed.");
@@ -51,22 +51,31 @@ public void Initialize(IEventSource eventSource)
                 {
                     throw new LoggerException("Failed to create log file: " + ex.Message);
                 }
-                else
-                {
-                    // Unexpected failure
-                    throw;
-                }
+
+                // Unexpected failure
+                throw;
             }
 
             eventSource.ProjectStarted += eventSource_ProjectStarted;
-            eventSource.TaskStarted += eventSource_TaskStarted;
+            eventSource.ProjectFinished += eventSource_ProjectFinished;
             eventSource.MessageRaised += eventSource_MessageRaised;
             eventSource.WarningRaised += eventSource_WarningRaised;
             eventSource.ErrorRaised += eventSource_ErrorRaised;
-            eventSource.ProjectFinished += eventSource_ProjectFinished;
         }
 
-        void eventSource_ErrorRaised(object sender, BuildErrorEventArgs e)
+        private void eventSource_ProjectStarted(object sender, ProjectStartedEventArgs e)
+        {
+            WriteLine(e.Message);
+            indent++;
+        }
+
+        private void eventSource_ProjectFinished(object sender, ProjectFinishedEventArgs e)
+        {
+            indent--;
+            WriteLine(e.Message);
+        }
+
+        private void eventSource_ErrorRaised(object sender, BuildErrorEventArgs e)
         {
             string line = $"{e.File}({e.LineNumber},{e.ColumnNumber}): error {e.Code}: {e.Message}";
 
@@ -81,7 +90,7 @@ void eventSource_ErrorRaised(object sender, BuildErrorEventArgs e)
             issuesStreamWriter.WriteLine(errorLine);
         }
 
-        void eventSource_WarningRaised(object sender, BuildWarningEventArgs e)
+        private void eventSource_WarningRaised(object sender, BuildWarningEventArgs e)
         {
             string line = $"{e.File}({e.LineNumber},{e.ColumnNumber}): warning {e.Code}: {e.Message}";
 
@@ -108,40 +117,6 @@ private void eventSource_MessageRaised(object sender, BuildMessageEventArgs e)
             }
         }
 
-        private void eventSource_TaskStarted(object sender, TaskStartedEventArgs e)
-        {
-            // TaskStartedEventArgs adds ProjectFile, TaskFile, TaskName
-            // To keep this log clean, this logger will ignore these events.
-        }
-
-        private void eventSource_ProjectStarted(object sender, ProjectStartedEventArgs e)
-        {
-            WriteLine(e.Message);
-            indent++;
-        }
-
-        private void eventSource_ProjectFinished(object sender, ProjectFinishedEventArgs e)
-        {
-            indent--;
-            WriteLine(e.Message);
-        }
-
-        /// <summary>
-        /// Write a line to the log, adding the SenderName
-        /// </summary>
-        private void WriteLineWithSender(string line, BuildEventArgs e)
-        {
-            if (0 == string.Compare(e.SenderName, "MSBuild", StringComparison.OrdinalIgnoreCase))
-            {
-                // Well, if the sender name is MSBuild, let's leave it out for prettiness
-                WriteLine(line);
-            }
-            else
-            {
-                WriteLine(e.SenderName + ": " + line);
-            }
-        }
-
         /// <summary>
         /// Write a line to the log, adding the SenderName and Message
         /// (these parameters are on all MSBuild event argument objects)