[vulkan, android] Initial implementation of LSFG-VK (#4263)

Pretty much self explanatory, own implementation based on LSFG-VK available with some additional reverse engineer work for the actual use of shaders inside Lossless.dll, we don't store/ bundle any tools that bypass security and self ownership: to use this feature is required to own your own copy of Lossless Scaling and I encourage to support developers behind this work.

Special thanks:

1.- THS - Original developer behind Lossless Scaling
2.- PancakeTAS - Developer behind LSFG-VK
3.- The Big Smolio The Sleeper (@gidoly)

Co-authored-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4263

src/common/settings.cpp

@@ -380,6 +380,28 @@ void UpdateRescalingInfo() {
     TranslateResolutionInfo(setup, info);
 }
 
+u32 FrameGenMultiplier() {
+    return std::clamp(values.frame_gen_multiplier.GetValue(), MIN_FRAME_GEN_MULTIPLIER,
+                      MAX_FRAME_GEN_MULTIPLIER);
+}
+
+size_t FrameGenGenerations() {
+    if (!values.frame_gen.GetValue()) {
+        return 0;
+    }
+    return FrameGenMultiplier() - 1;
+}
+
+size_t FrameGenMaxGenerations() {
+    if (!values.frame_gen.GetValue()) {
+        return 0;
+    }
+    if (values.frame_gen_target_rate.GetValue() != 0) {
+        return MAX_FRAME_GEN_MULTIPLIER - 1;
+    }
+    return FrameGenMultiplier() - 1;
+}
+
 void RestoreGlobalState(bool is_powered_on) {
     // If a game is running, DO NOT restore the global settings state
     if (is_powered_on) {