Fix integer related crashes, embellish settings screen
Summary: Also, delete the StopsDB (*sad face*) which nobody was using
Test Plan: Check that it builds and see if you like it
Reviewers: marcoM32, valerio.bozzolan
Reviewed By: valerio.bozzolan
Subscribers: valerio.bozzolan, Libre BusTO
Tags: Libre BusTO
Maniphest Tasks: T898
Differential Revision: https://gitpull.it/D67