Revert "Apply lightweight png compression"

This reverts commit 06d4fd2fb8.

osu.Game.Resources/Shaders/sh_CursorTrail.vs

@@ -1,12 +1,14 @@
 attribute vec2 m_Position;
 attribute vec4 m_Colour;
 attribute vec2 m_TexCoord;
+attribute vec4 m_TexRect;
 attribute float m_Time;
 
 varying vec2 v_DrawingPosition;
 varying vec2 v_MaskingPosition;
 varying vec4 v_Colour;
 varying vec2 v_TexCoord;
+varying vec4 v_TexRect;
 
 uniform mat4 g_ProjMatrix;
 uniform mat3 g_ToMaskingSpace;
@@ -27,5 +29,7 @@ void main(void)
     v_Colour = vec4(m_Colour.rgb, m_Colour.a * pow(clamp(m_Time - g_FadeClock, 0.0, 1.0), 1.7));
      
     v_TexCoord = m_TexCoord;
+    v_TexRect = m_TexRect;
+    
     gl_Position = g_ProjMatrix * vec4(m_Position, 1.0, 1.0);
-}
+}

osu.Game.Resources/Shaders/sh_LogoAnimation.fs

@@ -0,0 +1,14 @@
+#include "sh_Utils.h"
+
+varying mediump vec2 v_TexCoord;
+varying lowp vec4 v_Colour;
+
+uniform lowp sampler2D m_Sampler;
+uniform lowp float progress;
+
+void main(void) 
+{
+    vec4 colour = toSRGB(texture2D(m_Sampler, v_TexCoord, -0.9));
+    
+    gl_FragColor = colour.r < progress ? toSRGB(vec4(v_Colour.rgb, v_Colour.a * colour.a)) : vec4(0);
+}