New Visual Studio database engine for C++

Added extensions of new database engine for C++ (sqlite-based) from
Visual Studio 2015
(Tools - Options - Text Editor - C/C++ - Experimental - Enable New
Database Engine)

VisualStudio.gitignore

@@ -80,6 +80,8 @@ ipch/
 *.opensdf
 *.sdf
 *.cachefile
+*.VC.db
+*.VC.VC.opendb
 
 # Visual Studio profiler
 *.psess