Cryptos (Trade Crypto, Real Data, MySQL Support, All Gamemodes & More)

UPDATE

1. Added some safety checks to the serverside functions for giving/taking crypto if developers start using them.
2. Developers knowledgebase article: https://www.gmodstore.com/help/addon/-d0epg5JST2B83zSCEch9g/developers-10/topics/give-take-crypto
3. Added a clamp (minimum/maximum value) to the fetch interval config, so nobody accidentally sets it way to low and gets blocked.
4. Updated the visuals on the exchange rates billboard a bit.