message: Updated core and render namespace description
diff: /**
  * @namespace eos::core
  - * @brief Essential functions and classes to work with 3D face models and landmarks.
  + * @brief Essential functions and classes to work with 3D face models, meshes and landmarks.
  */
  /**
  /**
  * @namespace eos::render
  - * @brief 3D mesh and texture extraction functionality.
  + * @brief Software rendering and texture extraction functionality.
  */
  