imports from libregamewiki and some cvs to git conversions

entries/ltris.md

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+# LTris
+
+_Tetris clone._
+
+- Home: http://lgames.sourceforge.net/LTris/, https://sourceforge.net/projects/lgames/
+- State: mature, inactive since 2013
+- Download: https://sourceforge.net/projects/lgames/files/ltris/
+- Keywords: puzzle, open content, tetris-like
+- Code repository: https://svn.code.sf.net/p/lgames/code/trunk (svn part of it)
+- Code language: C
+- Code license: GPL-2.0
+- Code dependencies: SDL
+- Assets license: GPL-2.0
+
+Developer: Michael Speck
+
+## Building