Ensure that boostrapper --help always work

It should display something even when the boostrapper is in silent or very
silent mode.

Fixes #2099

src/Paket.Bootstrapper/ConsoleImpl.cs

@@ -49,13 +49,28 @@ internal static void WriteTrace(string message)
             WriteConsole(message, ConsoleColor.DarkGray, Verbosity.Trace);
         }
 
+        internal static void WriteAlways(string message, params object[] parameters)
+        {
+            WriteConsoleCore(string.Format(message, parameters), Console.ForegroundColor);
+        }
+
+        internal static void WriteAlways(string message)
+        {
+            WriteConsoleCore(message, Console.ForegroundColor);
+        }
+
         private static void WriteConsole(string message, ConsoleColor consoleColor, Verbosity minVerbosity = Verbosity.Normal)
         {
             if (Verbosity < minVerbosity)
             {
                 return;
             }
 
+            WriteConsoleCore(message, consoleColor);
+        }
+
+        private static void WriteConsoleCore(string message, ConsoleColor consoleColor)
+        {
             var oldColor = Console.ForegroundColor;
             Console.ForegroundColor = consoleColor;
             Console.WriteLine(message);

src/Paket.Bootstrapper/Program.cs

@@ -30,7 +30,7 @@ static void Main(string[] args)
                 Environment.GetEnvironmentVariables(), fileProxy, argumentsFromDependenciesFile);
             if (options.ShowHelp)
             {
-                ConsoleImpl.WriteInfo(BootstrapperHelper.HelpText);
+                ConsoleImpl.WriteAlways(BootstrapperHelper.HelpText);
                 return;
             }