Show stop suggestions from the database

Summary:
Search directly in the top bar the stops, either by id or by name.

Remove the search button, it is going to be replaced by the search action with the keyboard

Fixes T1442

Test Plan:
Test that the suggestions work:

• when searching ridiculous numbers or absurd names, there is a message text
• when clicking on a stop, the message disappears and the search too
• the floating action button never disappears

Also check nearby fragments (stops) for regression issues.

Reviewers: Libre BusTO hackers, valerio.bozzolan

Reviewed By: Libre BusTO hackers, valerio.bozzolan

Subscribers: valerio.bozzolan

Project Tags: Libre BusTO

Maniphest Tasks: T1442

Differential Revision: https://gitpull.it/D259