VS: Honor VS_SETTINGS property on all sources

Steven Boswellrequested to merge
ulatekh/cmake:vs_settings into master

Presently, the VS_SETTINGS source file property added by !4498 (merged) only applies to "extra" sources.
I need it to apply to regular source/header files.

The immediate need was to set "ExcludedFromBuild" using a generator-expression.
HEADER_FILE_ONLY doesn't support generator-expressions, so it wasn't an option.

VS_SETTINGS only affects the Visual Studio generators, so this should (hopefully) be an easy approval.

Edited by Brad King

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