Cannot handle SQLite database with UTF characters in their path or filename

Version: dbda4e7

Behaviors:
* Connect to a SQLite database named `测试.db` -> You end up connecting to a new (empty) database `%E6%B5%8B%E8%AF%95.db.db`
* Rename database to `测试/test.db` -> Cannot connect, error message is:
```
Unable to Connect to
The DB_DIR part of the connection string must point to a valid directory
```

Similar issue: #323