audio: WASAPI exclusive resampling, buffer size increase options (#727)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change

Resampler:
Implement resampler for exclusive mode streams, as we are seeing more
and more devices - not just laptops but onboard audio devices - that
only support 48khz and not 44.1khz. Should work with volume boost (gain
calculated inside resample) and also downmixer (hands off intermediate
scratch buffers).

Buffer size increase:
By default many of these games request a tiny buffer when in shared mode
(TDJ uses 3ms). On some audio setup this results in crackling due to
underflow. Add an option to forcibly increase the buffer size.

## Testing
With resampler set to 48kHz and buffer set to 20ms I can reliably boot
and play IIDX on my display port monitor's speakers; previously this
wasn't possible. IIDX is event-driven.

Tested SDVX7 as well at 48kHz, which opens timer-driven streams.

src/spice2x/hooks/audio/audio.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <optional>
 #include <string>
 
@@ -29,6 +30,13 @@ namespace hooks::audio {
     extern bool VOLUME_HOOK_ENABLED;
     extern std::optional<DownmixAlgorithm> DOWNMIX_ALGORITHM;
     extern float VOLUME_BOOST;
+
+    // target sample rate the hooked output is resampled to, if set
+    extern std::optional<uint32_t> RESAMPLE_RATE;
+
+    // minimum WASAPI exclusive buffer duration (milliseconds), if set. enlarges the device buffer
+    // to avoid underrun crackle on endpoints that cannot service a tiny buffer in time.
+    extern std::optional<uint32_t> EXCLUSIVE_BUFFER_MS;
     extern bool USE_DUMMY;
     extern WAVEFORMATEXTENSIBLE FORMAT;
     extern std::optional<Backend> BACKEND;