Trebuchet : default workspace

Change default screen to screen 0 (far left screen) to match
Launcher3. Clean up default layouts for various device types.

Also fix missing layouts for allAppsCling.

Update: Replace Books with Hangouts
Update: Clean and add non-GMS fallbacks
Update: Fix MMS being in sw70-non-telephony
Update: Cast checkitemplacement to long
Update: Layouts and avoid rounding issues for sw600dp

Change-Id: If0c3ad5ffcb8e2ee4b811251c0360f7512c31fdb