[Released] Referral system & Janitorai design settings fix

Version 1.5.0

Referral system is free alternative to paid membership. It's in beta version so there may be issues, but I guess I covered all cases.

Supports having an existing membership. Reward is added on top of that.

There will be no limit to getting rewards with referrals. It's installs per point, not clicks so the number for milestones will be smaller to make it easy for you to hit the numbers. You can share your thoughts, maybe what numbers you think is fair, comment please.

Fixed the issue of janitor ai big avatars and all font settings.