ui: show when type is built-in (issue #2)

* renamed DefinitionType to DefinitionKind
* passing DefinitionKind from Java to C++ instead of just a single bool
* omitting to create a symbol for undefined types

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src/lib_java/JavaProject.cpp

@@ -139,8 +139,10 @@ void JavaProject::fetchRootDirectories()
 		m_projectSettings->getAbsoluteExcludePaths(),
 		m_projectSettings->getSourceExtensions()
 	);
+
 	FileManager::FileSets fileSets = fileManager.fetchFilePaths(std::vector<FileInfo>());
 	std::shared_ptr<JavaEnvironment> javaEnvironment = JavaEnvironmentFactory::getInstance()->createEnvironment();
+
 	for (FilePath filePath: fileSets.addedFiles)
 	{
 		std::shared_ptr<TextAccess> textAccess = TextAccess::createFromFile(filePath.str());