Addressing the request to prepare the VS2017 solution for building x64 configuration.

Detailed changelog (for all projects):
Fixed (disabled) "enable full optimization (/O2)" parameter in debug mode.
Added x64 platform and configured.
Added and configured two new build configurations: Debug_Static and Release_Static. These configurations provide static libraries with statically linked MSVC runtime (/MT and /MTd switches).
Depending on configuration, output files now have suffixes: Release - no (i.e. libconfig.lib), Debug - d (i.e. libconfigd.lib), Release_Static - s (i.e. libconfigs.lib), Debug_Static - ds (i.e. libconfigds.lib).
Redirected the output of intermediate build files to \temp\(Platform)\(Project)\(Configuration) to enable the possibility of error-free batch build.
Redirected the output of final build files to \build\(Platform).
Added postbuild event for all applicable examples to copy appropriate *.cfg files also into \build\(Platform).
Added few VS-related lines to .gitignore for convenience.

.gitignore

@@ -12,3 +12,10 @@ Makefile.in
 stamp-h1
 *.la
 ac_config.h
+build
+temp
+.vs
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
\ No newline at end of file