Fix PowerShell#387: Add foreground colors and prefixes to Write-* command output

Author: daviwil

src/PowerShellEditorServices/Session/SessionPSHostUserInterface.cs

@@ -338,9 +338,10 @@ public override void WriteDebugLine(string message)
             if (this.consoleHost != null)
             {
                 this.consoleHost.WriteOutput(
-                    message,
+                    "DEBUG: " + message,
                     true,
-                    OutputType.Debug);
+                    OutputType.Debug,
+                    foregroundColor: ConsoleColor.Yellow);
             }
         }
 
@@ -349,9 +350,10 @@ public override void WriteVerboseLine(string message)
             if (this.consoleHost != null)
             {
                 this.consoleHost.WriteOutput(
-                    message,
+                    "VERBOSE: " + message,
                     true,
-                    OutputType.Verbose);
+                    OutputType.Verbose,
+                    foregroundColor: ConsoleColor.Blue);
             }
         }
 
@@ -360,9 +362,10 @@ public override void WriteWarningLine(string message)
             if (this.consoleHost != null)
             {
                 this.consoleHost.WriteOutput(
-                    message,
+                    "WARNING: " + message,
                     true,
-                    OutputType.Warning);
+                    OutputType.Warning,
+                    foregroundColor: ConsoleColor.Yellow);
             }
         }