feat: various improvements

- Update to MidnightLib 1.7.0 and use its features to make the config screen more reliable
- Fix background gradient being opaque briefly when fading out while not in a world
- Fix 1.21.5 compat (still compatible with 1.21.4 as well :D)

common/src/main/java/eu/midnightdust/blur/mixin/MixinScreen.java

@@ -26,7 +26,7 @@ public abstract class MixinScreen {
 
     @Inject(at = @At("HEAD"), method = "render")
     public void blur$processScreenChange(DrawContext context, int mouseX, int mouseY, float delta, CallbackInfo ci) {
-        Blur.onRender(context, width, height, this.client);
+        Blur.onRender(context, width, height, this.client, delta);
     }
     @Inject(at = @At("HEAD"), method = "renderInGameBackground")
     public void blur$getBackgroundEnabled(DrawContext context, CallbackInfo ci) {