Added UI blur

client/ui/blur/Blur.gdshader

@@ -0,0 +1,10 @@
+shader_type canvas_item;
+
+uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
+
+uniform float blur: hint_range(0.0, 5.0) = 3.0;
+
+void fragment() {
+	vec4 color = textureLod(SCREEN_TEXTURE, SCREEN_UV, blur);
+	COLOR = vec4(color.rgb, 1.0);
+}