Rename Publish-EchoArgs to Publish-PSTestTools

* Rename Publish-EchoArgs to Publish-PSTestTools so it can be used
  for other tools as well in the future
* Publish EchoArgs to the bin directory instead of run to match
  convention
* Add source URL to EchoArgs header comment
* Use wildcard of "*.nuget.props" to match
  "test/csharp/csharp.nuget.props" in .gitignore

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

@@ -4,7 +4,7 @@ Describe "Native Command Arguments" -tags "CI" {
     while ($powershellTestDir -notmatch 'test[\\/]powershell$') {
         $powershellTestDir = Split-Path $powershellTestDir
     }
-    $echoArgs = Join-Path (Split-Path $powershellTestDir) tools/EchoArgs/run/echoargs
+    $echoArgs = Join-Path (Split-Path $powershellTestDir) tools/EchoArgs/bin/echoargs
 
     It "Should handle quoted spaces correctly" {
         $a = 'a"b c"d'

test/tools/EchoArgs/EchoArgs.cs

@@ -1,5 +1,6 @@
 //---------------------------------------------------------------------
 // Author: Keith Hill
+// Source: https://github.com/Pscx/Pscx/blob/master/Src/EchoArgs/EchoArgs.cs
 //
 // Description: Very simple little console class that you can use to see
 //              how PowerShell is passing parameters to legacy console