Set up connection pool and enforce usage of it

Attempt to initialize connection pool on startup until a timeout.

src/main/java/config/ServerConfig.java

@@ -8,7 +8,6 @@ public class ServerConfig {
     public String DB_URL;
     public String DB_USER;
     public String DB_PASS;
-    public boolean DB_CONNECTION_POOL;
 
     //Login Configuration
     public int WORLDS;