add wind fade in/out + add wire movement when is windy

core/daynight/environment_dust.gdshader

@@ -2,6 +2,7 @@ shader_type canvas_item;
 
 uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
 global uniform float global_wind_speed;
+global uniform float global_wind_fade;
 
 uniform vec4 dust_color : source_color = vec4(1.0, 0.456, 0.125, 0.6);
 
@@ -30,7 +31,7 @@ void fragment() {
     float base_time = TIME * dust_speed;
 
     vec2 osc = vec2(sin(TIME * 0.5), cos(TIME * 0.3)) * wind_oscillation;
-    float wind_active = step(0.0001, abs(global_wind_speed));
+    float wind_active = global_wind_fade * step(0.0001, abs(global_wind_speed));
     vec2 final_wind = ((wind_speed + osc) * dust_speed) * wind_active;
 
     float final_particle_alpha = 0.0;