richedit: Prevent typing text at end of table row

[Dylan Smith]

This patch attempts to prevent the table being corrupted by typing text
at the end of a table.

Pressing enter at the end of a table row should append a table row,
but this is not handled yet for the v4.1 implementation of tables, so
instead it is prevented from doing anything to avoid corrupting the table.
---
 dlls/riched20/editor.c |   71 +++++++++++++++++++++++++++++++++++++++++++++++-
 dlls/riched20/editor.h |    1 +
 dlls/riched20/table.c  |   10 +++++--
 3 files changed, 78 insertions(+), 4 deletions(-)
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