Merge changes I7bffeb56,I945e5086,Ic801c654,I50c54322 into udc-qpr-dev

* changes:
  [Decor] Remove the now-unused main executor
  [Decor] Support ScreenDecorCommand in ScreenDecorations
  [ScreenDecor CLI] ScreenDecorCommand based on ParseableCommand
  [CommandLine] CLI parsing lib to work with Command