game entry file names changed to canonical version

games/twinengine.md

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+# TwinEngine
+
+_A Little Big Adventure engine._
+
+- Home: https://github.com/xesf/twin-e
+- State: mature, inactive since 2015
+- Keywords: adventure, game engine, remake, requires original content (Little Big Adventure 1)
+- Code repository: https://github.com/xesf/twin-e.git
+- Code language: C
+- Code license: GPL-2.0
+- Code dependencies: SDL
+
+## Building
+