Visual Studio builds: Support Visual Studio 2017
Update the autotools scripts so that we can support Visual Studio 2017 by copying the 2010 projects and updating items as needed to obtain the 2017 projects. Note that since the toolset version string changed for Visual Studio 2017, so allow the use of a custom toolset version string, otherwise just generate the toolset version string as we did before. Also, note that Visual Studio 2017 aims to be compatible with 2015 on the CRT level, so there should not be any problems using 2017-compiled binaries with 2015-compiled ones.
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