added merge tu grid Panel

moved borders to external components
added text field for one line with select

src/parser/converters/IntegerConverter.java

@@ -0,0 +1,10 @@
+package parser.converters;
+
+public class IntegerConverter implements ConverterInterface<Integer> {
+
+    @Override
+    public Integer convert(String content) {
+        content = content.replaceAll(" ", "");
+        return Integer.parseInt(content);
+    }
+}