Map Blacklist

Add a blacklist of maps that will prevent from hosting / downloading such maps.

Preferably with (popup) message explaining the reason. (usually cheat/imbalanced maps)

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/41899607-map-blacklist?utm_campaign=plugin&utm_content=tracker%2F52253969&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F52253969&utm_medium=issues&utm_source=github).