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A new command, Filer_Visibility allows various special OS applications such as
!Boot to be hidden from the Filer display. This is modelled on
the "Hide OS files" option in Windows Explorer.
Notes:
* Candidates for matching are !Boot, !Choices, !Scrap and !Territory (so
  allowing Choices and !Scrap to be moved out of !Boot in future).
* Matches must reside in the root of the drive on which <Boot$Dir> lives.
* Presently all can be hidden or none, but the command matcher allows for up
  to 255 arguments so in future other subsets could be added.
* Even when filtered from the root display, they can be manually opened such
  as through !ShowScrap. This is not attempting to make them totally vanish,
  just prevent accidental moves/deletes.
* The current "Hide OS files" setting is passed to Filer_Action via a new
  options flag Action_OptionExcludeOS so that it can suspend any action which
  might attempt to overwrite these special OS applications, and 2 new reason
  codes to Message_FilerControlAction keep any in progress operations in sync.

Version 2.49. Tagged as 'Filer-2_49'