Create an app template without using NIBs

[ronaldoussoren]

Recentish versions of Xcode don't seem to support Python anymore in Interface Builder. Therefore create an example project that creates the entire GUI programmatically.

While doing this keep track of changes that will make doing this more convenient (such as #275). Also consider working out a declarative system for doing these (either as code or as some kind of resource file that compiled into code or a NIB file).

A followup action will be to convert all other examples to the new format, but that's not in scope for this issue.