RICHED20: 2.0 and higher inserts CRCRLF as space (with tests)

[Alex Villacís Lasso]

While chasing the underlying cause of bug #5968, I found that native riched20
(when NOT emulating version 1.0) treats the sequence \r\r\n as special, in
that it converts the sequence into a single space. Although the attached
patch now tests for this behavior, this is NOT a fix for the bug.

Changelog:
* Rich Edit 2.x and higher converts the special sequence \r\r\n into a single
  space. Test included for EM_REPLACESEL, EM_SETTEXTEX, WM_SETTEXT.
* EM_REPLACESEL returns number of characters processed, not 0. Required for
  \r\r\n tests.
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