Ask for permissions on first run, show longest patterns first

Summary:

• Show patterns with more stops first in LinesDetailFragment

• Set compatibility of Java

• Manage permissions on first run, ask for notification

Test Plan:

• use old phone with Android <= 12: no nuclear implosions (notifications work)
• use new phone with Android > 12 and completely ignore the "Give permissions": no nuclear implosions (notifications do not work)
• use new phone with Android > 12 and manually run the Introduction (from menu) and give that permission: no nuclear implosions (notifications work)

Reviewers: valerio.bozzolan

Reviewed By: valerio.bozzolan

Subscribers: valerio.bozzolan, Libre BusTO

Tags: Libre BusTO

Differential Revision: https://gitpull.it/D147