The internal style flags are used to determine whether to show or hide
the scrollbar when ME_UpdateScrollBar is called.  EM_SHOWSCROLLBAR seems
to update this state in native richedit controls.

If the scrollbar style isn't initially used, then the scrollbar should
be shown.  Otherwise this can be a problem when the horizontal scrollbar
is shown for a single line richedit control, since it will cover all the
text (See bug 12088).

Previously a count of the carraige returns and line feeds were stored
for end of paragraph runs, and a paragraph sign was stored as the actual
string.  This was causing many special cases where the length of the
run needed to be determined differently if the run was or wasn't an
end of paragraph run.

There wasn't any use for storing the paragraph sign unless some drawing
code gets commented out to allow the end paragraphs to be shown,
therefore I changed the code to store the actual string that gets
retrieved by WM_GETTEXT.

Fixes Win64 compiler warnings.

The code path is taken when a valid wod isn't found. The loop thus
doesn't call waveInMessage() for each wid but retries the same wrong
wod.

Return value is analog to what the ALSA and OSS driver are doing.

comctl32: toolbar: Make sure all TBUTTON_INFO fields are initialized when a button is added in the middle.

The dde.c tests succeed on Windows and the DDE callback registered is
set to trigger on all messages it gets. Thus it looks like Windows
doesn't calls the callback in that case.

The code for the child windows works now for the standalone windows as well.