Profiles are read from profile.path

## Settings

- otr (defaults to true) - is this profile off-the-record
- name (defaults to the configuration file name)
- search (defaults to profile.search) - search engine url
- homepage (defaults to profile.homepage)
- newtab (defaults to profile.newtab)

### Properties
Key is property name; value is property value

### Attributes
see QWebEngineSetting::WebAttribute for list of IDs.
Key is attribute id; value is attribute value (true/false)