RICHED20: Implement EM_SETRECT, EM_SETRECTNP and WM_SETREDRAW messages

[Phil Krylov]

ChangeLog:
  Added EM_SETRECT, EM_SETRECTNP, and WM_SETREDRAW message handling.
  Added support for GT_SELECTION flag in EM_GETTEXTEX handler.

-- Ph.
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