imports from osgameclones, added backlog and rejected lists, started libregamewiki synchronization

games/dxx-rebirth.md

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+# DXX-Rebirth
+
+_Remake of Descent, Descent II._
+
+- Home: https://www.dxx-rebirth.com/
+- State: mature
+- Download: https://www.dxx-rebirth.com/download-dxx-rebirth/
+- Platform: Windows, Linux
+- Keywords: remake, first-person, inspired by Descent + Descent II, shooter
+- Code repository: https://github.com/dxx-rebirth/dxx-rebirth.git
+- Code language: C, C++, Python
+- Code license: GPL-3.0, Custom (derived from GPL-3.0)
+
+## Building