Minor refactoring for tool tasks

- Don't scan for translations on initialization in TranslationPageGenerator in order to speed up startup time of ToolsRunner
- Extract checking for null / empty array of File#listFiles into a separate method
- Move single method of RuntimeUtils into Utils class

src/main/java/fr/xephi/authme/util/RuntimeUtils.java

@@ -1,20 +0,0 @@
-package fr.xephi.authme.util;
-
-/**
- * Runtime utilities.
- */
-public class RuntimeUtils {
-
-    // Utility class
-    private RuntimeUtils() {
-    }
-
-    /**
-     * Return the available core count of the JVM.
-     *
-     * @return the core count
-     */
-	public static int getCoreCount() {
-		return Runtime.getRuntime().availableProcessors();
-	}
-}

src/main/java/fr/xephi/authme/util/Utils.java

@@ -48,4 +48,13 @@ public final class Utils {
             return false;
         }
     }
+
+    /**
+     * Return the available core count of the JVM.
+     *
+     * @return the core count
+     */
+	public static int getCoreCount() {
+		return Runtime.getRuntime().availableProcessors();
+	}
 }