feat: add Low GPU Accuracy setting for maximum performance

Implements a new "Low" GPU accuracy level that prioritizes performance
over accuracy by aggressively cutting corners in GPU emulation.

Changes:
- Add GpuAccuracy::Low enum and setting infrastructure
- Implement IsGPULevelNormal() helper function
- Skip texture cache checks and query operations
- Use unsafe memory reads for DMA operations
- Disable fence delays and query precision
- Add UI support for desktop (Qt) and Android

Performance optimizations:
- Skips texture cache coherency checks (vk/gl_rasterizer.cpp)
- Non-blocking query synchronization (query_cache.h)
- Unsafe memory operations (dma_pusher.cpp)
- No macro parameter refresh (maxwell_3d.cpp)
- Immediate fence signaling (fence_manager.h)
- Non-precise Vulkan queries (vk_query_cache.cpp)

Ideal for lower-end hardware and users prioritizing FPS over accuracy.
Works on both desktop and Android platforms.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/common/settings.cpp

@@ -150,6 +150,12 @@ bool IsGPULevelHigh() {
            values.current_gpu_accuracy == GpuAccuracy::High;
 }
 
+bool IsGPULevelNormal() {
+    return values.current_gpu_accuracy == GpuAccuracy::Extreme ||
+           values.current_gpu_accuracy == GpuAccuracy::High ||
+           values.current_gpu_accuracy == GpuAccuracy::Normal;
+}
+
 bool IsFastmemEnabled() {
     if (values.cpu_debug_mode) {
         return static_cast<bool>(values.cpuopt_fastmem);

src/common/settings.h

@@ -393,7 +393,7 @@ struct Values {
 #else
                                                       GpuAccuracy::High,
 #endif
-                                                      GpuAccuracy::Normal,
+                                                      GpuAccuracy::Low,
                                                       GpuAccuracy::Extreme,
                                                       "gpu_accuracy",
                                                       Category::RendererAdvanced,
@@ -661,6 +661,7 @@ extern Values values;
 void UpdateGPUAccuracy();
 bool IsGPULevelExtreme();
 bool IsGPULevelHigh();
+bool IsGPULevelNormal();
 
 bool IsFastmemEnabled();
 void SetNceEnabled(bool is_64bit);

src/common/settings_enums.h

@@ -130,7 +130,7 @@ ENUM(RendererBackend, OpenGL, Vulkan, Null);
 
 ENUM(ShaderBackend, Glsl, Glasm, SpirV);
 
-ENUM(GpuAccuracy, Normal, High, Extreme);
+ENUM(GpuAccuracy, Low, Normal, High, Extreme);
 
 ENUM(CpuBackend, Dynarmic, Nce);