Support for H2 databases

Signed-off-by: Rogiel <rogiel@rogiel.com>

config/database.properties

@@ -1,4 +1,4 @@
-jdbc.mysql.url = jdbc:mysql://localhost/l2jserver2
-jdbc.mysql.driver = com.mysql.jdbc.Driver
-jdbc.mysql.username = l2j
-jdbc.mysql.password = changeme
+jdbc.url = jdbc:h2:./data/database
+jdbc.driver = org.h2.Driver
+jdbc.username = l2j
+jdbc.password = changeme