Default to a title case app name

[nickwesselman]

App names should be Title Cased, and we should encourage that during app init. Instead of a kebab-cased random word name (adaptive-vertical-supply), we should default to a title cased random word name (Adaptive Vertical Supply). In doing so though we should also show the resulting folder name as the user types. This reinforces that

1. we aren’t going to use spaces in the generated file paths, and
2. if you provide your own name here, it should be the user-facing name

This change is intended to improve the quality of App Store submissions.