imports from libregamewiki and some cvs to git conversions

entries/marble_marcher.md

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+# Marble Marcher
+
+_3D game showcasing a fully ray marched graphics and making use of fractals and a fractal collision engine._
+
+- Home: https://codeparade.itch.io/marblemarcher
+- State: mature
+- Platform: Windows, Linux
+- Keywords: puzzle, open content
+- Code repository: https://github.com/HackerPoet/MarbleMarcher.git, https://github.com/WAUthethird/Marble-Marcher-Community-Edition.git (+)
+- Code language: C++
+- Code license: GPL-2.0
+- Assets license: ? (GPL-2.0)
+
+## Building
+
+- Build system: CMake