game entry file names changed to canonical version

games/vcmi_project.md

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+# VCMI Project
+
+_Engine for Heroes III, giving it new and extended possibilities._
+
+- Home: https://vcmi.eu/, https://sourceforge.net/projects/vcmi/
+- State: mature
+- Download: (see home)
+- Keywords: strategy
+- Code repository: https://github.com/vcmi/vcmi.git, https://sourceforge.net/p/vcmi/code/HEAD/tree/ (svn)
+- Code language: C++
+- Code license: GPL-2.0
+
+Requires original game data files.
+
+## Building
+