refactor: split frag0 into multiple files

default/frag5.glsl

@@ -1,4 +1,4 @@
-#include frag0.glsl
+#version 460
 
 // FX A
 // -------------
@@ -9,6 +9,13 @@
 in vec2 vUV;
 out vec4 fragColor;
 
+#include inc_fx.glsl
+
+uniform sampler2D iTex5;
+uniform sampler2D iTex7;
+uniform int iSeed5;
+uniform vec3 iMidi2_1[7];
+
 void main() {
     fragColor = fx_stage(vUV, iTex5, iTex7, iSeed5, iMidi2_1[0], iMidi2_1[1].xy, iMidi2_1[2], iMidi2_1[3].xy, iMidi2_1[4], iMidi2_1[5].xy, iMidi2_1[6]);
 }