Convert Privacy Policy content to indexed array and filter array to allow easy unsetting.

[garrett-eclipse]

Following a discussion from #45151 it would be nice to investigate the privacy policy content to see if it can be converted to an indexed array for easier manipulation through a new filter run prior to the foreach so that plugins/devs can add content or adjust the array without having to worry about the block editor markup.

Comment - https://core.trac.wordpress.org/ticket/45151?replyto=8#comment:8

[garrett-eclipse]

From Discussion in Slack - ​https://wordpress.slack.com/archives/C9695RJBW/p1543249228486600

The idea with this ticket is to have the content be an indexed array (multidimensional array) which uses the plugin slug as it's key/index so custom code can easily unset if desired.

[pputzer]

Properly indexing the array would be a huge benefit for plugin developers in privacy-related fields. Filtering the default policy text without them is ... not fun.