- Switch to binary 16 for UUID keys
- Remove AccountScopedRecord base class, all model use binary uuids now
- Fix the search sql to serialize uuids properly
- Patch the MySQL schema dumper to output binary lengths
We use a true/false preference so we can tell the difference between
disabling the watch vs never having the watch. This is so we can toggle
off and on the preferences for a container (like the bucket) without
losing any bubble-specific preferences.