added merge tu grid Panel

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

src/parser/converters/ConverterInterface.java

@@ -0,0 +1,7 @@
+package parser.converters;
+
+import com.sun.jdi.InvalidTypeException;
+
+public interface ConverterInterface<T> {
+    T convert(String content) throws InvalidTypeException;
+}