patch 9.0.1728: missing winid argument for virtcol()

Problem: missing winid argument for virtcol()
Solution: Add a {winid} argument to virtcol()

Other functions col(), charcol() and virtcol2col() support a {winid}
argument, so it makes sense for virtcol() to also support than.

Also add test for virtcol2col() with 'showbreak' and {winid}.

closes: #12633

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1728,
 /**/
     1727,
 /**/