Solidity token contract for a multi-level referral system

Fully functional token contract for any EVM network. There is a referral registration feature by nickname, after which commissions are accrued for each purchase and sale of tokens by referrals up to 7 levels and the ability to mint these commissions in tokens. There are Premium functions that unlock all 7 levels, while the Standard account has access to 3 levels of referrals.