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

radio/src/targets/simu/simpgmspace.cpp

@@ -21,6 +21,10 @@
 
 #define SIMPGMSPC_USE_QT    0
 
+#if defined(SIMU_AUDIO)
+  #include <SDL.h>
+#endif
+
 #include "opentx.h"
 #include "simulcd.h"
 
@@ -33,10 +37,6 @@
   #include <sys/time.h>
 #endif
 
-#if defined(SIMU_AUDIO)
-  #include <SDL.h>
-#endif
-
 int g_snapshot_idx = 0;
 
 uint8_t simu_start_mode = 0;