Add basic intel window.

Currently only shows the enemy's economic information.

https://github.com/Khopa/dcs_liberation/issues/658

qt_ui/widgets/QIntelBox.py

@@ -1,8 +1,15 @@
 from typing import Optional
 
-from PySide2.QtWidgets import QGroupBox, QHBoxLayout, QLabel, QVBoxLayout
+from PySide2.QtWidgets import (
+    QGroupBox,
+    QHBoxLayout,
+    QLabel,
+    QPushButton,
+    QVBoxLayout,
+)
 
 from game import Game
+from qt_ui.windows.intel import IntelWindow
 
 
 class QIntelBox(QGroupBox):
@@ -21,8 +28,14 @@ class QIntelBox(QGroupBox):
         self.total_ground_forces = QLabel()
         summary.addWidget(self.total_ground_forces)
 
+        details = QPushButton("Details")
+        columns.addWidget(details)
+        details.clicked.connect(self.open_details_window)
+
         self.update_summary()
 
+        self.details_window: Optional[IntelWindow] = None
+
     def set_game(self, game: Optional[Game]) -> None:
         self.game = game
         self.update_summary()
@@ -38,3 +51,7 @@ class QIntelBox(QGroupBox):
         self.total_aircraft.setText(f"Total enemy aircraft: {aircraft}")
         self.total_ground_forces.setText(
             f"Total enemy ground units: {ground_units}")
+
+    def open_details_window(self) -> None:
+        self.details_window = IntelWindow(self.game)
+        self.details_window.show()