Use newer C++ features

[JanEricNitschke]

• Modules: Can definitely use those
• Ranges: Lets see if there is something to use there
• Coroutines: Probably not until C++23?
• (More) constexpr
• Print over std::cout << (once gcc14 is out)
• Attributes, especially [[no_discard]] (at the declarations)
• Default comparison operators

[JanEricNitschke]

Ranges:

• Upper casing of string with std::ranges::transform: https://github.com/JanEricNitschke/TicTacToe/blob/main/tictactoe_cpp/src/tictactoe.cpp#L51
• Filling of array with std::ranges:fill: https://github.com/JanEricNitschke/TicTacToe/blob/main/tictactoe_cpp/include/tictactoe.h#L93
• Checking for win using std::ranges::all_of: https://github.com/JanEricNitschke/TicTacToe/blob/main/tictactoe_cpp/include/tictactoe.h#L126
• Can make the checkwinconditions more readable by giving names to the individual sets: https://github.com/JanEricNitschke/TicTacToe/blob/main/tictactoe_cpp/include/tictactoe.h#L241
• Use std::ranges::find_if in wincondition: https://github.com/JanEricNitschke/TicTacToe/blob/main/tictactoe_cpp/include/tictactoe.h#L294
• More use of auto, especially in minmax

[JanEricNitschke]

Modules:
https://github.com/royjacobson/modules-report