Combine uuid-old and uuid branch changes

- 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

app/models/push/subscription.rb

@@ -1,4 +1,4 @@
-class Push::Subscription < AccountScopedRecord
+class Push::Subscription < ApplicationRecord
   belongs_to :account, default: -> { Current.account }
   belongs_to :user