[WIP] Add descriptors and pipeline builder

graphics/rse_graphics.h

@@ -12,7 +12,7 @@ struct rse_graphics_context_t;
  * @param context Graphics context handle. Must be NULL!
  * @return rse_err_t RSE_ERROR_NO_ERROR on success
  */
-rse_err_t rse_graphics_init(struct rse_graphics_context_t* context);
+rse_err_t rse_graphics_init(struct rse_graphics_context_t** context);
 
 /**
  * @brief Runs graphics engine. This has to be called after all objects are added to the scene