logic: index and store Java annotations

* add annotation symbol kind
* add annotation_usage edge kind
* increment storage version
* record java annotation decls
* record java annotation member decls (as fields)
* update expected output of java sample project indexing tests
* add tests for recording annotations
* add annotation icon, annotation colors
* add new annotation node and edge types to legend

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

@@ -15,7 +15,8 @@ public enum ReferenceKind
 	TEMPLATE_MEMBER_SPECIALIZATION_OF(10),
 	INCLUDE(11),
 	IMPORT(12),
-	MACRO_USAGE(13);
+	MACRO_USAGE(13),
+	ANNOTATION_USAGE(14);
 	
 	private final int m_value;