PublishProfile version of built executable not included with installer

[TheOlympicon]

Looks like the build command needs appending with a publish arg so that Appveyor knows to do a publish step as part of the build.

According to the appveyor documentation (https://www.appveyor.com/docs/build-phase/), we need to include an msbuild.rsp file in the project that adds the arg to the build command.

The NSIS script will need modifying to import the published artifacts too.

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As a task to pick up at a later date, could be worth sorting through the runtimes included in the installer. If we're forcing the app to store all its .NET dependencies internally, we might not need as many dll's in the installer.