Add public constructors to gesture tutorial fragments.

The lack of public, no-arg constructors was causing the tutorial to crash on re-creation (eg. rotating the screen.) Added public constructors and refactored event logging.

Also added an update to the All Set page to allow the subtitle to display in one line.

Fixes: 226321558
Fixes: 226550217
Test: manual
Change-Id: I00a6135e658a66313df5e07833e6c6a20a618672