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a8a6be7ac1
This fixes several issues with compatibility with C++20. C++23 was also tested, but apparently it does not have any additional breaking changes compared to C++20 (or we don't have those). VCMI still uses C++17 as before - goal is only to make potential transition easier. There were 2 cases that are deprecated in C++20 that we use: - Floating point operations on enums are deprecated - `this` can no longer be captured when using default capture by value `[=]` Both of those should now be replaced with code that works fine in both C+ +17 and in C++20 mode