Add basic intel window.

Currently only shows the enemy's economic information.

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

qt_ui/windows/intel.py

@@ -0,0 +1,44 @@
+from PySide2.QtWidgets import (
+    QDialog,
+    QGroupBox,
+    QScrollArea, QVBoxLayout, QWidget,
+)
+
+from game.game import Game
+from qt_ui.uiconstants import ICONS
+from qt_ui.windows.finances.QFinancesMenu import FinancesLayout
+
+
+class EconomyIntelBox(QGroupBox):
+    def __init__(self, game: Game) -> None:
+        super().__init__("Economy")
+
+        widget = QWidget()
+        scroll_area = QScrollArea()
+        scroll_area.setWidgetResizable(True)
+        scroll_area.setWidget(widget)
+
+        scrolling_layout = QVBoxLayout()
+        widget.setLayout(scrolling_layout)
+
+        self.setLayout(QVBoxLayout())
+        self.layout().addWidget(scroll_area)
+
+        scrolling_layout.addLayout(FinancesLayout(game, player=False))
+
+
+class IntelWindow(QDialog):
+
+    def __init__(self, game: Game):
+        super().__init__()
+
+        self.game = game
+        self.setModal(True)
+        self.setWindowTitle("Intelligence")
+        self.setWindowIcon(ICONS["Statistics"])
+        self.setMinimumSize(600, 250)
+
+        layout = QVBoxLayout()
+        self.setLayout(layout)
+
+        layout.addWidget(EconomyIntelBox(game))