chore: Convert simu/simulator/companion to SDL2 (#3085)

* chore(pc): convert simu/simulator/companion to use SDL2

* switch companion builds to SDL2 - OSX is not converted
the linux change is done a bit hacky, it should be done by updating the EdgeTX docker container

* update build system setup scripts

* add compatibility for old and new SDL2 cmake integration

* fix windows installer

* fix simulator audio on windows by using DirectSound vie SDL2

* fix windows audio with SDL2
enable simu for windows builds

* remove workflow changes for linux builds, this needs to be fixed in the build environment

* fix OSX build, thx @pafleraf

* fix windows audio for companion and simulator with SDL2

* select SDL2 branch of the build-docker environment

* Revert "select SDL2 branch of the build-docker environment"

This reverts commit da801609d78e1aed513ad7d9d8ab3ebded2900b9.

* fix tests with SDL2

companion/src/simulator.cpp

@@ -270,6 +270,9 @@ int main(int argc, char *argv[])
   #ifdef SIMU_AUDIO
     sdlFlags |= SDL_INIT_AUDIO;
   #endif
+  #if defined(_WIN32) || defined(_WIN64)
+  putenv("SDL_AUDIODRIVER=directsound");
+  #endif
   if (SDL_Init(sdlFlags) < 0) {
     showMessage(QApplication::translate("SimulatorMain", "WARNING: couldn't initialize SDL:\n%1").arg(SDL_GetError()), QMessageBox::Warning);
   }