DATAMATRIX: add manual FNC1 support

CODE128: error on unrecognized extra escape sequences instead of
  just passing them thru;
  fix possible shifting before manual FNC1 in 2nd position
  after single alpha (otherwise won't be recognized as AIM)
  fix not removing manual FNC1 in 1st/2nd position from content
  segs (as implied by symbology identifier)
CLI: warn if both "--dmre" and "--square" given (as "--square"
  overwrites "--dmre")
common: new routines `z_isalpha()`, `z_extra_escapes()` and
  `z_ct_set_seg_extra_escapes_eci()`
library: new helper `supports_extra_escape_mode()`;
  fix some error_number dups
BWIPP: update to latest, and allow for removal of DBAR_LTD_CC RHS
  quiet zones & extra row when have add-on in EAN/UPC composites
test suite: fix BWIPP escaping
manual/man/tcl: update for DATAMATRIX manual FNC1 support
Windows: resource scripts: make more consistent (libzint, CLI, GUI)
win32/README: update with MSVC 2026

backend/tests/tools/bwipp_dump-barcode.ps.cat

@@ -98,6 +98,32 @@ ret /pixs known {
         pixs 0 tmppixs 0 j getinterval putinterval
     } if
 
+    b (databarlimitedcomposite) eq {
+        % Add RHS 5-space quiet zone
+        /cpypixs pixs length array def
+        cpypixs 0 pixs 0 pixs length getinterval putinterval
+        /pixw pixs length pixx idiv def
+        /pixs [
+            0 pixx cpypixs length 1 sub {
+                /i exch def
+                cpypixs i pixx getinterval aload pop 0 0 0 0 0
+            } for
+        ] def
+        /pixx pixx 5 add def
+    } if
+
+    b (ean13composite) eq b (ean8composite) eq or b (upcacomposite) eq or b (upcecomposite) eq or {
+        d (|) search {
+            /linear exch def
+            pop pop
+            linear ( ) search {  % Have add-on?
+                pop pop pop
+                % Remove last row from pixs array which just contains add-on overhang
+                /pixs [ pixs 0 pixs length pixx sub getinterval aload pop ] def
+            } { pop } ifelse
+        } { pop } ifelse
+    } if
+
     /xs systemdict /xs known { systemdict /xs get cvi } { 0 } ifelse def
     /xe systemdict /xe known { systemdict /xe get cvi } { 0 } ifelse def