Adding bases to the code generator. Code text edit, fixing input/output ID control, etc.

Software/sie_cg/block_editor/arrow.cpp

@@ -196,6 +196,8 @@ void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *,
                 SECLine->setColor(myColor);
         }
     }
+    painter->setBrush(Qt::lightGray);
+    painter->drawPolygon(this->path().toFillPolygon());
     setSelectedArrows();
 }