riched20: Move undo handling to a different set of structs as the display item structs are not a good fit.

[Huw Davies]

---
 dlls/riched20/caret.c   |  12 +-
 dlls/riched20/editor.c  |  10 +-
 dlls/riched20/editor.h  |   7 +-
 dlls/riched20/editstr.h |  90 ++++++--
 dlls/riched20/list.c    |  31 +--
 dlls/riched20/para.c    |  31 +--
 dlls/riched20/run.c     |  24 +--
 dlls/riched20/undo.c    | 533 ++++++++++++++++++++++++++----------------------
 8 files changed, 396 insertions(+), 342 deletions(-)

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