Configurable RF/TCN/ICLS/LINK4 with UI feedback

Resolves #70

Freq/Channel will turn orange when double booked.
Freq will turn red if GUARD freq was assigned.

qt_ui/windows/QRadioFrequencyDialog.py

@@ -0,0 +1,60 @@
+from typing import Optional
+
+from PySide2.QtCore import Qt, QLocale
+from PySide2.QtWidgets import (
+    QDialog,
+    QPushButton,
+    QLabel,
+    QHBoxLayout,
+    QDoubleSpinBox,
+)
+
+from game.radio.Link4Container import Link4Container
+from game.radio.RadioFrequencyContainer import RadioFrequencyContainer
+from game.radio.radios import RadioRange, kHz, MHz
+from qt_ui.uiconstants import EVENT_ICONS
+
+
+class QRadioFrequencyDialog(QDialog):
+    def __init__(
+        self,
+        parent=None,
+        container: Optional[RadioFrequencyContainer] = None,
+        range: RadioRange = RadioRange(MHz(225), MHz(400), kHz(25)),
+        link4: bool = False,
+    ) -> None:
+        super().__init__(parent=parent)
+        self.container = container
+        self.setMinimumWidth(400)
+
+        # Make dialog modal to prevent background windows to close unexpectedly.
+        self.setModal(True)
+
+        self.setWindowTitle("Assign frequency")
+        self.setWindowIcon(EVENT_ICONS["strike"])
+
+        layout = QHBoxLayout()
+
+        self.frequency_label = QLabel("FREQ (MHz):")
+        self.frequency_input = QDoubleSpinBox()
+        self.frequency_input.setRange(
+            range.minimum.mhz, range.maximum.mhz - range.step.mhz
+        )
+        self.frequency_input.setSingleStep(range.step.mhz)
+        self.frequency_input.setDecimals(3)
+        self.frequency_input.setLocale(QLocale(QLocale.Language.English))
+        self.frequency_input.setValue(225.0)
+        layout.addWidget(self.frequency_label)
+        layout.addWidget(self.frequency_input)
+
+        self.create_button = QPushButton("Save")
+        self.create_button.clicked.connect(self.accept)
+        layout.addWidget(self.create_button, alignment=Qt.AlignRight)
+
+        self.setLayout(layout)
+
+        if link4 and isinstance(container, Link4Container):
+            if container.link4:
+                self.frequency_input.setValue(container.link4.mhz)
+        elif container.frequency:
+            self.frequency_input.setValue(container.frequency.mhz)