Move and "publish" EchoArgs for the tests

* Move EchoArgs from test/EchoArgs to test/tools/EchoArgs
* Use "dotnet publish" for building EchoArgs in build.psm1 so the test
  can call it directly

test/powershell/Scripting/NativeExecution/NativeCommandArguments.Tests.ps1

@@ -4,27 +4,18 @@ Describe "Native Command Arguments" -tags "CI" {
     while ($powershellTestDir -notmatch 'test[\\/]powershell$') {
         $powershellTestDir = Split-Path $powershellTestDir
     }
-    $echoArgsDir = Join-Path (Split-Path $powershellTestDir) EchoArgs
-
-    function Start-EchoArgs {
-        Push-Location $echoArgsDir
-        try {
-            dotnet run $args
-        } finally {
-            Pop-Location
-        }
-    }
+    $echoArgs = Join-Path (Split-Path $powershellTestDir) tools/EchoArgs/run/echoargs
 
     It "Should handle quoted spaces correctly" {
         $a = 'a"b c"d'
-        Start-EchoArgs $a 'a"b c"d' a"b c"d >$testPath
+        & $echoArgs $a 'a"b c"d' a"b c"d >$testPath
         $testPath | Should Contain 'Arg 0 is <ab cd>'
         $testPath | Should Contain 'Arg 1 is <ab cd>'
         $testPath | Should Contain 'Arg 2 is <ab cd>'
     }
 
     It "Should handle spaces between escaped quotes" {
-        Start-EchoArgs 'a\"b c\"d' "a\`"b c\`"d" >$testPath
+        & $echoArgs 'a\"b c\"d' "a\`"b c\`"d" >$testPath
         $testPath | Should Contain 'Arg 0 is <a"b c"d>'
         $testPath | Should Contain 'Arg 1 is <a"b c"d>'
     }

test/tools/EchoArgs/EchoArgs.cs

@@ -19,10 +19,6 @@ namespace Pscx.Applications
             {
                 Console.WriteLine("Arg {0} is <{1}>", i, args[i]);
             }
-
-            /*Console.WriteLine("\nCommand line:");
-            Console.WriteLine(Environment.CommandLine);*/
-            Console.WriteLine();
         }
     }
 }