gitadora: (arena model) asio option (#718)

## Link to GitHub Issue or related Pull Request, if one exists
#717 

## Description of change
Add an option to override the ASIO device.

By default the game will try to use any ASIO driver that contains the
string `XONAR` in it.

## Testing
Tested with FlexASIO.

src/spice2x/games/gitadora/gitadora.cpp

@@ -1,4 +1,5 @@
 #include "gitadora.h"
+#include "asio.h"
 #include "handle.h"
 #include "bi2x_hook.h"
 #include <unordered_map>
@@ -28,6 +29,7 @@ namespace games::gitadora {
     std::optional<std::string> SUBSCREEN_OVERLAY_SIZE;
     std::optional<socd::SocdAlgorithm> PICK_ALGO = socd::SocdAlgorithm::PreferRecent;
     std::optional<uint8_t> ARENA_WINDOW_COUNT = std::nullopt;
+    std::optional<std::string> ASIO_DRIVER = std::nullopt;
 
     /*
      * Prevent GitaDora from creating folders on F drive
@@ -612,6 +614,9 @@ namespace games::gitadora {
             detour::iat_try("GetDriveTypeA", GetDriveTypeA_hook, avs::game::DLL_INSTANCE);
             detour::iat_try("CreateDirectoryA", CreateDirectoryA_hook, avs::game::DLL_INSTANCE);
 
+            // ASIO driver redirect (XONAR -> user-configured driver)
+            asio_hook_init();
+
             // volume change prevention
             hooks::audio::mme::init(avs::game::DLL_INSTANCE);