logic: add lots of Java indexing fixes

* update JavaSymbolSolver to version 0.6.0
* moved to Javaparser 3.3.0
* fixed solving type parameter names in symbols solved in jar files
* implemented ignoring name contexts in javassist and jre based method signatures to break infinite recursion

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

@@ -21,6 +21,11 @@ public class CallableMethodDecl implements CallableDecl
 		return m_decl;
 	}
 	
+	public boolean isMethod()
+	{
+		return true;
+	}
+	
 	public String getName()
 	{
 		return m_decl.getNameAsString();