feat(graphics): add 0.25X quarter resolution downscaling

- Add Res1_4X resolution setup with down_shift=2
- Mark as EXPERIMENTAL in UI labels
- Support on both Qt and Android frontends

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

src/common/settings.cpp

@@ -264,6 +264,11 @@ const char* TranslateCategory(Category category) {
 void TranslateResolutionInfo(ResolutionSetup setup, ResolutionScalingInfo& info) {
     info.downscale = false;
     switch (setup) {
+    case ResolutionSetup::Res1_4X:
+        info.up_scale = 1;
+        info.down_shift = 2;
+        info.downscale = true;
+        break;
     case ResolutionSetup::Res1_2X:
         info.up_scale = 1;
         info.down_shift = 1;