fixes to dbQuery class - corrected abstract methods and added proper null checks
finished dbPool class and added new dbPoolSize class to handle warning messages
renamed get() to load() in dbConfig when loading from strings
renamed dbManager.newConfig() to register(config)
added required hook back to dbManager.registerConfig()
added get/set methods for decimal, double, and float in dbQuery class
DELETE queries should use executeUpdate(), not executeQuery()