PrivacyManager settings + Custom logo should be stored using Option:: rather than in config file

[mattab]

For consistency, it would be nice if the PrivacyManager plugin + Custom logo ([Branding] section) stored its data in the DB rather than in the config file.

The ultimate goal is to make Piwik not need to write to the config file during normal operations.

1. Create global config entries for the following settings:
2. delete_logs_max_rows_per_query
3. delete_reports_enable
4. delete_reports_older_than
5. delete_reports_keep_basic_metrics
6. delete_reports_keep_day_reports
7. delete_reports_keep_week_reports
8. delete_reports_keep_month_reports
9. delete_reports_keep_year_reports
10. delete_reports_keep_range_reports
11. delete_reports_keep_segment_reports
12. Read the following settings from config instead of option if delete old data admin UI is disabled
13. delete_logs_enable
14. delete_logs_schedule_lowest_interval
15. delete_logs_older_than
16. delete_logs_max_rows_per_query
17. delete_reports_enable
18. delete_reports_older_than
19. delete_reports_keep_basic_metrics
20. delete_reports_keep_day_reports
21. delete_reports_keep_week_reports
22. delete_reports_keep_month_reports
23. delete_reports_keep_year_reports
24. delete_reports_keep_range_reports
25. delete_reports_keep_segment_reports

The values from the option table should overwrite the values from the config in case the delete old data admin UI is enabled. It should not be possible to set a value in the option table while the delete old data admin UI is disabled.

1. Migrate entries from config to option database table:
2. Following config settings to be stored in the DB using Option::set and Option::get
3. Upgrade: convert config file values to the new format in db. Then explicitely remove the settings from config file.
4. Values are cached in the file tmp/cache/tracker/ file for fast access during tracker mode using the existing hook to add to cache/tracker/x.php in case they are used during the tracker process

Here are the config settings that, should be removed in favor of Option::

• use_anonymized_ip_for_visit_enrichment
• ip_address_mask_length
• [Branding] use_custom_logo

Note:

• The "enabled" setting is already using Option:: mechanism.

[tsteur]

In 883ecc8: refs #4563 moved custom logo from config to database

[tsteur]

In 0e3592f: refs #4563 fix cached version was not used because there are more than 3 entries

[tsteur]

In e36c596: refs #4563 PrivacyManager Settings should be in Config and Option table, also removed some completely from config as described in ticket

[tsteur]

In 1d64882: refs #4563 make sure getting purge data settings works if UI is disabled

[mattab]

In e6af591: Refs #4563 Hiding message that config is not writable, when writing to the config file is disabled anyway.