Spotlog development

Continued to develop the spotlog application, and is probably ready to be used ... but there's always more to do.

Main screen for entering sightings:

The "book" tab shows info on classes and locos.  This screen shows the classes of the Rhátische Bahn:

Clicking on a class takes us to the detail for that class:

The green "tick" shows a record against that loco.

Finally, the log screen shows the log:

The orange camera icon indicates a picture was recorded.