Make ActivityPrincipal the default activity
Summary:
Fix stuff in build
Set title of activity while changing screen
Fix permission for storage
Fix NearbyStopsFragment not showing up on GPS activation
Test Plan: Build, Install, and test
Reviewers: valerio.bozzolan
Reviewed By: valerio.bozzolan
Subscribers: valerio.bozzolan, Libre BusTO
Tags: Libre BusTO
Maniphest Tasks: T840
Differential Revision: https://gitpull.it/D57