Translate c++ code to pure c

[Assemberist]

It was old sticker.
The project is mostly written on c++ so it is better to revrite it with better practices of c++. And also internal data structures can collapse some elements to std elements (use vector and other containers).

[Assemberist]

Some small parts can be done on pure C but not business-logic nor object system.

[Assemberist]

As part of the issue:

1. Move "static log* l;" from object and state classes to new class (done with Curiously recurring template pattern).
2. Simplify item class: internal struct info can be collapsed since it is unused.
3. item_def has been deleted as unused.
4. Target list removed from object as unused (possibly target list will be choosed in alles class).

[Assemberist]

stat field of object class is public. Should it be protected?