game entry file names changed to canonical version

games/dash_engine.md

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+# Dash Engine
+
+_OpenGL engine written in the D language._
+
+- Home: https://dash.circularstudios.com/
+- State: mature, inactive since 2015
+- Keywords: framework
+- Code repository: https://github.com/Circular-Studios/Dash.git
+- Code language: D
+- Code license: MIT
+
+## Building
+