[externals] Update to SDL3 (#3952)

Since the launch of the steam controller I think it's only best to push towards updating to SDL3 allowing for a wider range of controller support

I went ahead and started on getting it working. Everything here should be functional, I've personally tested it all on Arch Linux. Still untested on windows, so looking for feedback on that

Any feedback and help would be appreciated!

Main changes:
- Bump everything to SDL3
- Handle SDL3 audio and input
- Add steam controller support, including HD Rumble
- Improved battery reporting via the status icon by using real % rather than state alone

Co-authored-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3952
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/audio_core/sink/sink_details.cpp

@@ -16,8 +16,8 @@
 #ifdef HAVE_CUBEB
 #include "audio_core/sink/cubeb_sink.h"
 #endif
-#ifdef HAVE_SDL2
-#include "audio_core/sink/sdl2_sink.h"
+#ifdef HAVE_SDL3
+#include "audio_core/sink/sdl3_sink.h"
 #endif
 #include "audio_core/sink/null_sink.h"
 #include "common/logging.h"
@@ -71,9 +71,9 @@ constexpr SinkDetails sink_details[] = {
         &GetCubebLatency,
     },
 #endif
-#ifdef HAVE_SDL2
+#ifdef HAVE_SDL3
     SinkDetails{
-        Settings::AudioEngine::Sdl2,
+        Settings::AudioEngine::Sdl3,
         [](std::string_view device_id) -> std::unique_ptr<Sink> {
             return std::make_unique<SDLSink>(device_id);
         },
@@ -115,10 +115,10 @@ const SinkDetails& GetOutputSinkDetails(Settings::AudioEngine sink_id) {
         // BEGIN REINTRODUCED FROM 3833 - REPLACED CODE BLOCK ABOVE - DIABLO 3 FIX
         // Auto-select a backend. Prefer CubeB, but it may report a large minimum latency which
         // causes audio issues, in that case go with SDL.
-#if defined(HAVE_CUBEB) && defined(HAVE_SDL2)
+#if defined(HAVE_CUBEB) && defined(HAVE_SDL3)
         iter = find_backend(Settings::AudioEngine::Cubeb);
         if (iter->latency() > TargetSampleCount * 3) {
-            iter = find_backend(Settings::AudioEngine::Sdl2);
+        iter = find_backend(Settings::AudioEngine::Sdl3);
         }
 #else
         iter = std::begin(sink_details);