add exec method to smartshell class

ts/smartshell.classes.smartshell.ts

@@ -38,6 +38,15 @@ export class Smartshell {
     return await smartshellWrap.execSilent(commandArg)
   }
 
+  /**
+   * executes and returns IExecResult
+   * @param commandArg
+   */
+  async exec (commandArg: string) {
+    let execCommand = this.createExecString(commandArg)
+    return await smartshellWrap.exec(commandArg)
+  }
+
   /**
    * creates the final sourcing string
    * @param commandArg