This is required for when helpers include json-encoded variables as arguments.
As an example, imagine a template with content:

{{# str }} somekey, someidentifier, { "fullname": "{{ fullname }}" } {{/ str }}

If the fullname variable were to include the double-quote character (e.g.
John "Trevor" Doe) because of the way in which mustache renders content, it
would become:

{{# str }} somekey, someidentifier, { "fullname": "John "Trevor" Doe" } {{/ str }}

This results in an invalid JSON structure.

To work around this issue, the quote characters in the passed variable
must be escaped:

{{# str }} somekey, someidentifier, { "fullname": "John \"Trevor\" Doe" } {{/ str }}

Unfortunately, Mustache provides no way of doing so natively.

With this function, we can quote the text as appropriate:

{{# str }} somekey, someidentifier, { "fullname": {{# quote }}{{ fullname }}{{/ quote }} } {{/ str }}

This also handles the case where the quoted content includes the Mustache
delimeter ({{ or }}).

For example:
fullname = 'John "}}Trevor{{" Doe'

Ordinarily this would be rendered as:
{{# str }} somekey, someidentifier, { "fullname": "John "}}Trevor{{" Doe" } {{/ str }}

This rendering is both a JSON error, and also a mustache syntax error because of the mustache delimeters.

The quote helper also escapes these by wrapping them in change delimeter
tags:

{{# str }} somekey, someidentifier, { "fullname": "John "{{=<% %>=}}}}<%={{ }}=%>Trevor{{=<% %>=}}{{{{=<% %>=}}" Doe" } {{/ str }}

Sync is now automatically triggered by add/update instance. We need
to manually trigger sync before each part of the test to clean up
role assignments from the previous test.

We can not rely on the db engine returning results in the same order
if no order is specified in get_comments and get_annotations.

Also fixing a related unit test.

This restores backwards compatible behaviour.

External tests only