Reclassify irrlicht as graphics engine

From irrlicht's homepage: "The Irrlicht Engine is an open source high performance realtime 3D engine written in C++." Not a game engine.

Author: stevensona

README.md

@@ -255,7 +255,6 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [GamePlay](https://github.com/gameplay3d/GamePlay) - A cross-platform native C++ game framework for creating 2D/3D mobile and desktop games. [Apache2]
 * [Godot](https://github.com/godotengine/godot) - A fully featured, open source, MIT licensed, game engine. [MIT]
 * [Grit](http://www.gritengine.com/) - Community project to build a free game engine for implementing open world 3D games. [MIT]
-* [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]
 * [Oxygine](http://oxygine.org/) - A cross-platform 2D C++ game engine. [MIT]
 * [Panda3D](https://github.com/panda3d/panda3d) - A game engine, a framework for 3D rendering and game development for Python and C++ programs. [Modified BSD] [website](https://www.panda3d.org/)
 * [Polycode](https://github.com/ivansafrin/Polycode) - A cross-platform framework for creative code in C++ (with Lua bindings). [MIT] [website](http://polycode.org/)
@@ -287,6 +286,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [Cairo](http://www.cairographics.org/) - A 2D graphics library with support for multiple output devices. [LGPL2 or Mozilla MPL]
 * [GLFW](https://github.com/glfw/glfw) - A simple, cross-platform OpenGL wrangling library. [zlib/libpng]
 * [Horde3D](https://github.com/horde3d/Horde3D) - A small 3D rendering and animation engine. [EPL]
+* [Irrlicht](http://irrlicht.sourceforge.net/) - A high performance realtime 3D engine written in C++. [zlib]
 * [magnum](https://github.com/mosra/magnum) - C++11 and OpenGL 2D/3D graphics engine. [MIT] [website](http://mosra.cz/blog/magnum.php)
 * [Ogre 3D](http://www.ogre3d.org/) :zap: - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT]
 * [OpenSceneGraph](http://www.openscenegraph.org/) - An open source high performance 3D graphics toolkit. [OSGPL]