Use SQLite instead of pickle for object handling

[viralpoetry]

Krzysztof,
Thanks for sharing your source code! It's clean and easy to read.

Not sure whether you are still working on it, but I think it should be better to use some database for the objects, so some future API can use it as well. Hence I have created this issue.

[TheKysek]

Thank you for your interest!

I was planning on changing the method of object sorage but it is not a high priority issue.
However I will definitely run some tests and do something about it at a later day.

[Lvl4Sword]

https://docs.python.org/3/library/pickle.html states

Warning

The pickle module is not secure against erroneous or maliciously constructed data. Never unpickle data received from an untrusted or unauthenticated source.

So I can understand why pickling is ill-advised 👍