richedit: Implemented undo coalescing to group typing events

[Dylan Smith]

Consecutively typed characters are grouped together to be undone
together.  The grouping of typed characters can be stopped by certain
events that are mentioned in MSDN's remarks on the EM_STOPGROUPTYPING
message, which is also implemented by this patch.
---
 dlls/riched20/editor.c       |   37 ++++++++++---
 dlls/riched20/editor.h       |    6 ++-
 dlls/riched20/editstr.h      |    3 +-
 dlls/riched20/list.c         |    1 +
 dlls/riched20/tests/editor.c |   30 +++++-----
 dlls/riched20/undo.c         |  118 ++++++++++++++++++++++++++++++++++++++---
 6 files changed, 159 insertions(+), 36 deletions(-)
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