Add ticket paper width selector and improve thermal cut/print layout

pos/services/thermal_printer.py

@@ -100,7 +100,8 @@ def generate_ticket(sale_data, business_info, width=80):
     buf += 'Gracias por su compra!\n'.encode('cp437', errors='replace')
     buf += 'Nexus Autoparts POS\n'.encode('cp437', errors='replace')
     buf += b'\n\n\n'
-    buf += PARTIAL_CUT
+    buf += FEED + b'\x05'      # Feed 5 lines before cutting
+    buf += CUT                  # Full cut
 
     return bytes(buf)
 
@@ -187,7 +188,8 @@ def generate_quotation_ticket(quote_data, business_info, width=80):
     buf += 'Precios sujetos a disponibilidad\n'.encode('cp437', errors='replace')
     buf += 'Nexus Autoparts POS\n'.encode('cp437', errors='replace')
     buf += b'\n\n\n'
-    buf += PARTIAL_CUT
+    buf += FEED + b'\x05'
+    buf += CUT
 
     return bytes(buf)
 
@@ -338,6 +340,7 @@ def generate_service_order_ticket(so_data, business_info, width=80):
     buf += "No es comprobante fiscal\n".encode("cp437", errors="replace")
     buf += "Nexus Autoparts POS\n".encode("cp437", errors="replace")
     buf += b"\n\n\n"
-    buf += PARTIAL_CUT
+    buf += FEED + b'\x05'
+    buf += CUT
 
     return bytes(buf)