Convert AphrontErrorView to safe HTML

Summary: Done by searching for `AphrontErrorView` and then `appendChild()`.

Test Plan:
Looked at Commit Detail.
Looked at Revision Detail.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4843
Convert AphrontFormInsetView to safe HTML

Summary: Done by searching for `AphrontFormInsetView` and verifying all method calls.

Test Plan: /repository/edit/1/tracking/

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4845
Convert AphrontFormView to safe HTML

Summary: Searched for `AphrontFormView` and then for `appendChild()`.

Test Plan: /login/

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4855
Convert AphrontFormLayoutView to safe HTML

Summary: Searched for `AphrontFormLayoutView` and then `appendChild()`.

Test Plan: /V1

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4856
Kill some PhutilSafeHTML

Summary: Also couple of unrelated Ponder changes.

Test Plan: /Q5

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4858