v0.9.27: Issue/#319 Ladder map repitition (#398)

* Add sqlalchemy with asyncio

* Add test for excluding last played maps

* If all maps were played recently, just pick a random one

* Query laddergames by looking for "ladder1v1" gamemod

* Close db connections when server shuts down

* Only return map_id

* Clean up imports

* Remove mysql specific types

* Replace db_pool with sqlalchemy engine everywhere

* Add test for empty map pool case

* Remove logging cursor

* Rename faction "nomads" to "nomad"

* Add debug for game timeout

* Clean up some formatting

* Make sure to fetch ladder results.

* Add test for querying ladder history from db.

* Set ladder maps correctly.

* Replace fetchall with async for iteration where possible.

* Refactor update_game_player_stats

* Fix stuff I missed during rebase

* Row is a dict cursor

* Fix column name

* Add typing for map tuple