R1:5a3e3994f582

Make PonderQuestionEditor use ApplicationTransactions

Summary:
Ref T3373. Make PonderQuestions editable and use transactions.

This temporarily disables some stuff:

- email;
- feed;
- comments;
- voting.

I'll restore those in followups and wait to land this until they're at least mostly back online.

The transactions themselves also need more string/color/icon work.

Test Plan: Created and edited questions. Viewed transactions.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

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