build: switch to Maven configuration for JavaIndexer

java_indexer/src/main/java/com/sourcetrail/ReferenceKind.java

@@ -0,0 +1,31 @@
+package com.sourcetrail;
+
+public enum ReferenceKind
+{ // these values need to be the same as ReferenceKind in C++ code
+	UNDEFINED(0),
+	TYPE_USAGE(1),
+	USAGE(2),
+	CALL(3),
+	INHERITANCE(4),
+	OVERRIDE(5),
+	TEMPLATE_ARGUMENT(6),
+	TYPE_ARGUMENT(7),
+	TEMPLATE_DEFAULT_ARGUMENT(8),
+	TEMPLATE_SPECIALIZATION_OF(9),
+	TEMPLATE_MEMBER_SPECIALIZATION_OF(10),
+	INCLUDE(11),
+	IMPORT(12),
+	MACRO_USAGE(13);
+	
+	private final int m_value;
+	
+    private ReferenceKind(int value) 
+    {
+        this.m_value = value;
+    }
+
+    public int getValue() 
+    {
+        return m_value;
+    }
+}