Save PetData and RiderPetData as bitmasks. Fixes #107

This change fixes #107, and changes the table structure to:

```
+--------------+--------------+------+-----+---------+-------+
| Field        | Type         | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+-------+
| OwnerName    | varchar(36)  | NO   | PRI |         |       |
| PetType      | varchar(255) | YES  |     | NULL    |       |
| PetName      | varchar(255) | YES  |     | NULL    |       |
| PetData      | bigint(20)   | YES  |     | NULL    |       |
| RiderPetType | varchar(255) | YES  |     | NULL    |       |
| RiderPetName | varchar(255) | YES  |     | NULL    |       |
| RiderPetData | bigint(20)   | YES  |     | NULL    |       |
+--------------+--------------+------+-----+---------+-------+
```

.. where PetData and RiderPetData are bitmask representations as defined in [SQLUtil][0]

[0]: https://github.com/eueln/EchoPet/blob/f1af315fd1e9afb3b9bb74d4ddb024a2a68a9d5f/modules/API/src/main/java/com/dsh105/echopet/compat/api/util/SQLUtil.java#L27