game entry file names changed to canonical version

games/openra.md

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+# OpenRA
+
+_Recreates and modernizes the classic Command & Conquer real time strategy games._
+
+- Home: http://www.openra.net/
+- Media: <https://en.wikipedia.org/wiki/Command_%26_Conquer:_Red_Alert#Open_source_remake>
+- State: mature
+- Download: http://www.openra.net/download/
+- Keywords: strategy, real time
+- Code repository: https://github.com/OpenRA/OpenRA.git
+- Code language: C#
+- Code license: GPL-3.0
+
+## Building
+