Terracotta blocks have differing rotations on each side, necessitating different handling for each directional map render. This fix was aligned against "Light Grey Glazed Terracotta", I'm presuming the rest of the colors follow.
Updates to the Windows build instructions, terminology pulled from the current "Visual Studio Community 2017" version, which is the free version of VS at this time. I wrote these as a first timer building Overviewer. I also moved all of the pre-requisites to a bulleted list under a single header.
BobFrankly