Add more real exchanges, add some fake exchanges for testing and simulations, add placeholder country code

[pgc-dev]

This PR does a few things:

• Adds a lot more real exchanges, unfortunately I created a bit of a mess doing this and I tried to add more than the ones i needed directly, I will try to clean this up in a future PR but i wanted to scaffold things in case anyone else is looking to contribute
• Adds placeholders for "paper trading" and "simulation", as well as the "XXXX" exchange
• Add "XX" and "XXX" country codes for "uncategorized"
• Added an enum for trading type with Live, Paper, Simulation, and Backtest

[timkpaine]

Thanks! This is a bit messy but I think it's fine for now, we should move these static/reference assets somewhere else if they're not needed but we can do that in a separate PR. I can do a release after merging as well?