Resolve "Voxel cone tracing"

Closes #82 (closed)

projects/voxelization/resources/shaders/sky.frag

+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) out vec3 outColor;
+
+layout( push_constant ) uniform constants{
+    vec3 skyColor;
+    float skyStrength;
+};
+
+void main()	{
+    outColor = skyColor * skyStrength;
+}
\ No newline at end of file