On Win7, calling powershell via MSBuild results in normal output lines being split based on the ConHost system-wide default line length settings.
The fix is to first write all the lines to a file, then load that file as into an MSBuild ItemGroup. This avoids all interaction with ConHost.
$(TargetPath) is a simpler way of getting the primary output than assembling it from multiple variables. In addition, $(OutputType) matches $(TargetExt) only for .exe projects.
Add lib\ and lib\manual-link\ to additional library paths.
[gtest] Because the four libraries provided by gtest supply redundant symbols and define main, opt them all out.
Addresses #306.
