TomTom&rsquo;s now-eponymous app used to be called TomTom AmiGO and was a bit of a second citizen in the line-up, behind the premium TomTom GO (now called GO Expert). After the recent shake-up, it&rsquo;s harder to understand the product visions behind these two apps. On one hand, the functionality of TomTom is much more restricted than that of GO Expert. On the other, it uses the company&rsquo;s…