Centralize design decisions about opmon-archive

I absolutely agree. The design document could be hosted on the wiki in a prominent place and progress could be tracked with projects.

At the moment, the code needs a lot of cleanup as well. For one, it won't compile with MSVC in the state it's in. The existing CMake file implies Linux, Mac, and Windows as the targeted platforms. That could probably be expanded to all the platforms that SFML supports (like Android). Checking that the code compiles at all could be done with actions.

I suggest coding standards be established and enforced. If compiling on other (non-Linux) platforms is a goal, writing portable code is a necessity and in general, cleaner code will make the project easier to develop and more likely to attract contributions.

[milkyroute]

For now, my top priority is to cleanup the code (which we've been doing for some months already). However, I'll try to detail this at the same time. To be honest, we haven't any precise plans for towns, NPCs and stuff like this, we only have a skeleton for the history, region and gameplay.
I think we should discuss this on Discord since there is a lot of decisions to take, and some others that we have already taken but should be criticized.

I'll at least try to do a list of what we already have decided (without further detail) as soon as possible.