More user friendly game loading screen

**What do you want to see?**
Instead of just a file open dialog, it could be a list of games, and when you pick a game it defaults to the most recent turn and lets you pick a player (or the host if available) and go back to an old turn if you want.

**How would it help players?**
Make it easier for players to load games

**Alternatives**
???

**Screenshots and mockups**
N/A

**Things to consider**
???

**Related issues**
N/A