#1874 Introduce individual ConsoleLogger instance per class (#1875)

* #1874 Introduce individual ConsoleLogger instance per class
- Create ConsoleLoggerFactory from which a separate logger can be created for each class
- Allows to support individual log level settings in the future

* Fix CodeStyle issue

* Replace full class name with import

* Update usages after merge from master

src/main/java/fr/xephi/authme/output/ConsoleLoggerFactory.java

@@ -0,0 +1,51 @@
+package fr.xephi.authme.output;
+
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.settings.Settings;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Creates and keeps track of {@link ConsoleLogger} instances.
+ */
+public final class ConsoleLoggerFactory {
+
+    private static final Map<String, ConsoleLogger> consoleLoggers = new ConcurrentHashMap<>();
+    private static Settings settings;
+
+    private ConsoleLoggerFactory() {
+    }
+
+    /**
+     * Creates or returns the already existing logger associated with the given class.
+     *
+     * @param owningClass the class whose logger should be retrieved
+     * @return logger for the given class
+     */
+    public static ConsoleLogger get(Class<?> owningClass) {
+        String name = owningClass.getCanonicalName();
+        return consoleLoggers.computeIfAbsent(name, ConsoleLoggerFactory::createLogger);
+    }
+
+    /**
+     * Sets up all loggers according to the properties returned by the settings instance.
+     *
+     * @param settings the settings instance
+     */
+    public static void reloadSettings(Settings settings) {
+        ConsoleLoggerFactory.settings = settings;
+        ConsoleLogger.initializeSharedSettings(settings);
+
+        consoleLoggers.values()
+            .forEach(logger -> logger.initializeSettings(settings));
+    }
+
+    private static ConsoleLogger createLogger(String name) {
+        ConsoleLogger logger = new ConsoleLogger(name);
+        if (settings != null) {
+            logger.initializeSettings(settings);
+        }
+        return logger;
+    }
+}