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
- class CGuiHandler is now called GameEngine to better describe its
functionality
- renamed global GH to more clear ENGINE
- GH/ENGINE is now unique_ptr to make construction / deconstruction
order more clear and to allow interface / implementation split
- CGuiHandler.cpp/h is now called GameEngine.cpp/h and located in root
directory of client dir
All assets generation (large spellbook, terrain animations, etc) are now
done in memory and used as it, without saving to disk.
This should slightly improve load times since there is no encode png /
decode png, and should help with avoiding strange bug when vcmi fails to
load recently saved assets.
If needed, such assets can be force-dumped on disk using already
existing console command
Fixes two bugs, one was definitely happening, and 2nd one that is causing
undefined behavior and may work only in some std implementations
- VideoPlayer would attempt to access subtitles widget after VideoPlayer
itself was destroyed in onPlaybackFinished call
- std::function was destroyed from a function that is being called by
it. Replaced with 1-method interface to avoid usage of std::function in
this scenario
