Added shaders from i-mic-fps, preload shaders if cyberarm_engine/opengl has been required.

assets/shaders/include/light_struct.glsl

@@ -0,0 +1,11 @@
+struct Light {
+  int  type;
+  vec3 direction;
+  vec3 position;
+
+  vec3 diffuse;
+  vec3 ambient;
+  vec3 specular;
+
+  float intensity;
+};