game entry file names changed to canonical version

games/irrlicht_engine.md

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+# Irrlicht Engine
+
+_The Irrlicht Engine is an open source high performance real time 3D engine._
+
+- Home: http://irrlicht.sourceforge.net/
+- Media: https://en.wikipedia.org/wiki/Irrlicht_Engine
+- State: mature
+- Download: http://irrlicht.sourceforge.net/?page_id=10
+- Keywords: framework, 3D
+- Code repository: https://github.com/zaki/irrlicht.git (mirror), https://sourceforge.net/p/irrlicht/code/HEAD/tree/ (svn)
+- Code language: C++, C
+- Code license: zlib
+
+## Building
+
+Includes manually created MSVC project files in the source folder.
+