Rewrite resourcegroup/updatefromgrid processor to class based

My small contribution to the general initiative - https://github.com/modxcms/revolution/issues/11437 . And I am confused that this processor is not used anywhere really.
Fix the file name and compatibility with php < 5.5
Replace modProcessor to modObjectProcessor
Rewrite resourcegroup/updatefromgrid processor to class based

* origin/pr/11452:
  Replace modProcessor to modObjectProcessor
  Fix the file name and compatibility with php < 5.5
  Rewrite resourcegroup/updatefromgrid processor to class based