cpp17

There is constexpr, consteval but constinit is not described.
It could be worth to add it.

Required skills: Python

Difficulty: Easy

For the initial asset conversion, openage provides textual output to signal which stage of conversion has been reached. The output usually looks like this:

INFO [py] converting metadata
INFO [py] [0] palette
INFO [py] [1] empires.dat
INFO [py] Starting conversion...
INFO [py] Extracting Genie data...
INFO [py] Creating API-like ob

First of all, great library!

I am having some confusion in understanding the role of values_first2 in set_difference_by_key as mentioned here.

In general terms, the result of set difference D = A - B will not contain values from B therefore values_first2 can never be part of D. So `val

Is your feature request related to a problem? Please describe.
When running the game in windowed mode there is no frame, which means the game cannot be moved around the screen easily.

Describe the solution you'd like
Window frame added when in Window mode. Mouse behaviour as below:
When 'in game' the mouse should be 'captured' from the OS, but when you're on the Menu screen after pre