Adding convenience shell wrappers and tweaking composer post update cmd

composer.json

@@ -8,6 +8,9 @@
     "post-install-cmd": [
       "taskman\\DotnetSupport::install"
     ],
+    "post-update-cmd": [
+      "taskman\\DotnetSupport::install"
+    ],
     "autoload": {
         "classmap": ["dotnet.inc.php"]
     }

dotnet.inc.php

@@ -17,6 +17,16 @@ task('dotnet_install', function() {
   DotnetSupport::install();
 });
 
+function dotnet_shell($cmd)
+{
+  shell('dotnet ' . $cmd);
+}
+
+function dotnet_shell_get($cmd)
+{
+  return shell_get('dotnet ' . $cmd);
+}
+
 function dotnet_install(string $version) 
 {
   $has_dotnet = true;