🚚 Move shader code to GLSL files

resources/shaders/apparition-declarations.glsl

@@ -0,0 +1,13 @@
+// Inject some common shader snippets. It is only possible to include glsl files from the
+// "common" directory. Also, the files in the "common" directory are not allowed to
+// include any further files.
+#include "common/uniforms.glsl"
+
+uniform vec2 uSeed;
+uniform float uShake;
+uniform float uTwirl;
+uniform float uSuction;
+uniform float uRandomness;
+
+const float ACTOR_SCALE = 2.0;
+const float PADDING     = ACTOR_SCALE / 2.0 - 0.5;