A number of tests were relying on the fact that x32/x64 were being converted implicitly to x86/x86_64. If/when we retire those symbols, all of those tests would break. Renamed them now to avoid having to sort it out later. Also fixed up comments to keep everything consistent.
- use like: filter { "configurations:Debug" }
- supported prefixes: action, architecture, configurations, files, kind, language, options, platforms, system
- defaults to "configurations" if no prefix is specified
