Add FastAPI interface between the game and map.

A possible explanation for the infrequent CTDs we've been seeing since
adding fast forward is that QWebChannel doesn't keep a reference to the
python objects that it passes to js, so if the object is GC'd before the
front end is done with it, it crashes.

We don't really like QWebChannel anyway, so this begins replacing that
with FastAPI.

qt_ui/main.py

@@ -9,7 +9,7 @@ from typing import Optional
 from PySide2 import QtWidgets
 from PySide2.QtCore import Qt
 from PySide2.QtGui import QPixmap
-from PySide2.QtWidgets import QApplication, QSplashScreen, QCheckBox
+from PySide2.QtWidgets import QApplication, QCheckBox, QSplashScreen
 from dcs.payloads import PayloadDirectories
 
 from game import Game, VERSION, persistency
@@ -18,6 +18,7 @@ from game.data.weapons import Pylon, Weapon, WeaponGroup
 from game.db import FACTIONS
 from game.dcs.aircrafttype import AircraftType
 from game.profiling import logged_duration
+from game.server import GameContext, Server
 from game.settings import Settings
 from game.theater.start_generator import GameGenerator, GeneratorSettings, ModSettings
 from qt_ui import (
@@ -135,6 +136,7 @@ def run_ui(game: Optional[Game]) -> None:
 
     # Apply CSS (need works)
     GameUpdateSignal()
+    GameUpdateSignal.get_instance().game_loaded.connect(GameContext.set)
 
     # Start window
     window = QLiberationWindow(game)
@@ -333,7 +335,8 @@ def main():
         lint_weapon_data_for_aircraft(AircraftType.named(args.aircraft))
         return
 
-    run_ui(game)
+    with Server().run_in_thread():
+        run_ui(game)
 
 
 if __name__ == "__main__":