game entry file names changed to canonical version

games/mechcommander_2_omnitech.md

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+# MechCommander 2 Omnitech
+
+_Upgraded and more easily moddable version of the good old Mechcommander 2._
+
+- Home: https://github.com/Echelon9/mechcommander2-open, http://www.hard-light.net/forums/index.php?board=210.0
+- Media: https://en.wikipedia.org/wiki/MechCommander_2
+- State: beta, inactive since 2013
+- Keywords: action
+- Code repository: https://github.com/Echelon9/mechcommander2-open.git
+- Code language: C++
+- Code license: Ms-PL
+
+## Building
+