Updated all solution and project files to VS2017.

.gitignore

@@ -190,8 +190,10 @@ src/Makefile
 ####
 # Files generated by Visual Studio
 
-projects/demo/.vs/
-projects/demo/demo.exe
-projects/demo/demo.ilk
-projects/demo/demo.pdb
-projects/demo/demo.vcxproj.user
+projects/*/.vs/
+projects/*/*.exe
+projects/*/*.ilk
+projects/*/*.pdb
+projects/*/*.vcxproj.user
+projects/*/Release/
+projects/*/Debug/