_descr and info parameters not being exclusive for object descriptions

[Toma400]

At first, when doing classes, races and all other elements, info was default key which was required to aid IoA to description key.
However, I see that when doing attributes and skills at least, I started using .descr function which just added _descr to the regular key, making it much simpler, yet less controllable.
For now, for simplicity purposes, I will try to rewrite old stuff to work with .descr, however old idea of info key should still be available, if someone wants to override default naming.

[Toma400]

I think using Python function Lyofi suggested me for other thing could be handy, that were doing "get this key from dict, else N".

file.get("info", f"{file.get('key')}_descr")

Something along those lines. Since this issue is rather small, but neat, it will be passed to pre-alpha 3b.

[Toma400]

This requires more tweaking than I imagined at first, so I think I'm pushing this at least to pre-alpha 4. Don't want to bother myself with this kind of stuff when already boring things are in the way (translating).

#84 is basically biggest issue that keeps me from doing it with just simple few changes in code.

[Toma400]

Unbinding milestone for now, as part of code on which this issue bases on needs some proper rewrite overall.