imports from libregamewiki and some cvs to git conversions

entries/mars.md

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+# M.A.R.S.
+
+_A ridiculous shooter. In one of several game modes, two opposing teams are fighting in a gravitational 2D space with a few planets, including their homes._
+
+- Home: https://sourceforge.net/projects/mars-game/, https://packages.debian.org/search?keywords=marsshooter
+- State: beta, inactive since 2016
+- Download: https://github.com/jwrdegoede/M.A.R.S./releases, https://sourceforge.net/projects/mars-game/files/
+- Keywords: platform, 2D, open content, shooter, top-down
+- Code repository: https://github.com/jwrdegoede/M.A.R.S..git, https://github.com/thelaui/M.A.R.S..git (+), https://svn.code.sf.net/p/mars-game/code/ (svn)
+- Code language: C++, C
+- Code license: GPL-3.0
+- Code dependencies: OpenGL, SFML
+- Assets license: CC-BY 3.0, CC-BY-SA-3.0, PD
+
+Developer: Simon Schneegans, Felix Lauer
+
+## Building
+
+- Build system: CMake