richedit: Implemented undo coalescing to group typing events

[Dylan Smith]

The implementation is based on what I have observed in wordpad within
Windows XP. Consecutively typed characters appear to be grouped
together until the control loses focus, or the cursor is moved with the
mouse or keyboard arrows.
---
 dlls/riched20/editor.c  |    8 +++-
 dlls/riched20/editor.h  |    2 +
 dlls/riched20/editstr.h |    3 +-
 dlls/riched20/list.c    |    1 +
 dlls/riched20/undo.c    |  104 +++++++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 112 insertions(+), 6 deletions(-)
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