Added the Qusino smart contract

[TakaYuPP]

Qusino Smart Contract
Overview
Qusino is a smart contract for a game platform economy. It introduces in-platform assets (STAR, QSC, QST), staking with time-based rewards, game proposal submission and community voting, and revenue sharing to LP, treasury, CCF, and shareholders.
Main ideas
Dual in-platform assets
STAR: earned by spending Qubic (at a fixed price). Used for voting on game proposals and can be staked.
QSC: earned by depositing QST with the contract; comes with a STAR bonus. Used as an alternative currency to buy QST and can be staked.
QST (Qusino Share Token)
Buy: Users can buy QST with Qubic (via QX order book integration) or with QSC. Sale inventory is supplied by depositing QST via depositQSTForSale.
Sell: Holders can sell QST back to the contract for Qubic at a fixed sale price, increasing the amount available for sale.
Staking
Users can stake STAR, QSC, or QST for 1, 3, 6, or 12 months. At maturity they receive principal plus a STAR reward (percentage depends on lock duration). Staking increases protocol engagement and lock-up.
Game lifecycle
Submit: Anyone can submit a game proposal (URI) by paying a fixed submission fee; fee goes to epoch revenue.
Vote: STAR holders pay a small vote fee (STAR is burnt) to vote yes/no on proposals. Voting is limited per user and only in the proposal epoch or a defined revote window.
Outcome: Proposals that get more “no” than “yes” (in the relevant epoch) are moved to a failed list; passed games remain in the active list.
Revenue distribution (end of epoch)
Epoch revenue (from STAR purchases, game submission fees, etc.) is split: LP, CCF, treasury, and shareholder dividends (with a fixed denominator for dividend math). This aligns incentives across liquidity providers, treasury, and token holders.

https://github.com/nineisten/qusino

[cyber-pc]

Looks good from my side—these changes cover my comments.
About @Franziska-Mueller comment, I think it's more or less caused by tested machine memory, not by the public/protected, I saw it took about >8GB for your test.

[cyber-pc]

Disclaimer: I have spent several hours reviewing syntaxes, math overflows and compatability issue with qubic core to make sure this SC doesn't interrupt qubic network. I don’t have enough time for understanding all details and verifying the correctness of the code, but this also isn’t my responsibility as a core dev. Ensuring correctness of the code and security of the funds in the contract is the responsibility of the team developing the contract.