Dot-source debugged scripts into the shared session

This change causes scripts executed in the debugger to be dot-sourced into
the shared session so that the functions defined in the script can be
experimented with after debugging is complete.

Resolves PowerShell/vscode-powershell#540.

Author: daviwil

src/PowerShellEditorServices/Session/PowerShellContext.cs

@@ -699,15 +699,16 @@ public async Task ExecuteScriptWithArgs(string script, string arguments = null,
                 // Related to issue #123.
                 if (File.Exists(script) || File.Exists(scriptAbsPath))
                 {
-                    script = EscapePath(script, escapeSpaces: true);
+                    // Dot-source the launched script path
+                    script = ". " + EscapePath(script, escapeSpaces: true);
                 }
 
                 launchedScript = script + " " + arguments;
-                command.AddScript(launchedScript);
+                command.AddScript(launchedScript, false);
             }
             else
             {
-                command.AddCommand(script);
+                command.AddCommand(script, false);
             }
 
             if (writeInputToHost)