logic: add type information of variable decl to name hierarchy

* implemented this feature for both, CXX and Java
* adjusted tests to reflect these changes
* added NameElement and NameHierarchy to Java code
* created more specialized JavaDeclName classes: JavaFunctionDeclName and JavaVariableDeclName
* implemented recording static modifier for Java methods and variables

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java_indexer/src/main/java/com/sourcetrail/name/NameHierarchy.java

@@ -0,0 +1,69 @@
+package com.sourcetrail.name;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+public class NameHierarchy 
+{
+	private List<NameElement> m_elements = new ArrayList<>();
+	
+	public NameHierarchy()
+	{
+	}
+	
+	public NameHierarchy(String name)
+	{
+		m_elements.add(new NameElement(name));
+	}
+	
+	public NameHierarchy(NameElement name)
+	{
+		m_elements.add(name);
+	}
+	
+	public NameHierarchy(List<NameElement> names)
+	{
+		m_elements.addAll(names);
+	}
+	
+	public void push(NameElement element)
+	{
+		m_elements.add(element);
+	}
+	
+	public void pop()
+	{
+		if (!m_elements.isEmpty())
+		{
+			m_elements.remove(m_elements.size() - 1);
+		}
+	}
+	
+	public Optional<NameElement> peek()
+	{
+		if (!m_elements.isEmpty())
+		{
+			return Optional.of(m_elements.get(m_elements.size() - 1));
+		}
+		return Optional.empty();
+	}
+	
+	public String serialize()
+	{
+		String serialized = ".\tm";
+		
+		for (int i = 0; i < m_elements.size(); i++)
+		{
+			if (i != 0)
+			{
+				serialized += "\tn";
+			}
+			
+			serialized += m_elements.get(i).serialize();
+		}
+
+		return serialized;
+	}
+	
+}