imports from libregamewiki, conversions cvs to git, correcting keywords and code dependencies

entries/shotgun_debugger.md

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+# Shotgun Debugger
+
+_Shooting game which uses a 3d engine but allows 2d gameplay._
+
+- Home: https://www.gamecreation.org/games/shotgun_debugger
+- State: mature, inactive since 2005
+- Platform: Windows, Linux, macOS
+- Keywords: remake, shooter, top-down
+- Code repository: (see home)
+- Code language: C++
+- Code license: GPL-2.0
+
+## Building