* 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
This fails for two reasons
1) shell scripts run in their own instance, so this would be lost as
soon as the script finishes.
2) more importantly, this is Ubuntu, which has a short-circuit at the
top of the .bashrc to prevent it from running in a non-interactive shell
