LogService. Added saving game started event to DB. Some refactoring.

Mage.Server/src/main/java/mage/server/services/MageService.java

@@ -0,0 +1,18 @@
+package mage.server.services;
+
+/**
+ * Common interface for all services.
+ *
+ * @author noxx
+ */
+public interface MageService {
+    /**
+     * Restores data on startup.
+     */
+    void initService();
+
+    /**
+     * Dumps data to DB.
+     */
+    void saveData();
+}