[OzzModz] Force Rules Accept 2.1.1

2.1.1:
- XF 2.3 compatibility
- Added option to force terms and rules accept form for guests before viewing content

2.1.0:

• Added ability to create custom tabs
• Added [AddonFlare] Paid Registrations support
• Added option to disable timer ticking if the user has changed tab or minimized the browser
• Added option to force user to check the checkboxes for confirmation in all tabs
• Added optional tracking of reading all tabs (button will be disabled until the user has scrolled to the bottom of all tabs)

Thanks to @Anomandaris for sponsoring this update

Fix: missing phrase
Fix: workaround to force rule acceptance page if terms wasn't never updated

Notice: this add-on now adds a column to xf_users table
Recommended to use CLI for large forums with 1M+ users registered.

Fix: undefined index errors if add-on options is not updated yet

Changelog:
- Allow to hide rules "accept" checkbox without enabling accept form
- New feature: force rules accept by resetting "terms accepted" field on registration (may be useful for external registration scripts)

Fixed: Input filter for "force to re-read the rules" (was always true)

Changelog:
- Added [OzzModz] prefix to add-on title
- Added timer on rules to prevent accepting without reading (can be disabled in add-on options)
- Added "member notification" option on user warning to force to re-read the rules

ATTENTION:
Add-on option keys was changed. Reconfiguration may be required if upgrading from earlier versions.