maintenance (replaced dead links, added Git repositories, code dependencies, ...)

games/delta_engine.md

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+# Delta Engine
+
+_Multi-platform Game Engine, C# OpenGL Version (custom wrapper) including the Editor._
+
+- Home: https://deltaengine.net/
+- State: mature, inactive since 2015
+- Download: https://deltaengine.net/download
+- Keywords: framework
+- Code repository: https://github.com/DeltaEngine/DeltaEngine.git (https://github.com/DeltaEngine)
+- Code language: C#
+- Code license: Apache-2.0
+
+## Building