core+gui: timezone-correct datetimes, deep-copy WillItem, dead code removal, explicit imports

bal/gui/qt/plugin.py

@@ -15,14 +15,35 @@ and cached in ``self.bal_windows``.
 """
 
 from electrum.gui.qt.main_window import StatusBarButton
+from electrum.plugin import hook
 from electrum.util import EventListener, event_listener
 from PyQt6.QtWidgets import QLayout
 
-from .common import *
-from .common import (  # underscore names are not re-exported by "import *"
+from .common import (
     _,
     _logger,
+    BalPlugin,
+    Buttons,
+    EnterButton,
+    HelpButton,
+    PasswordDialog,
+    QComboBox,
+    QGridLayout,
+    QHBoxLayout,
+    QInputDialog,
+    QLabel,
+    QPushButton,
+    QTimer,
+    QVBoxLayout,
+    QWidget,
+    UserCancelled,
+    Willexecutors,
+    add_widget,
+    partial,
     read_QIcon_from_bytes,
+    read_QPixmap_from_bytes,
+    show_modal,
+    webopen,
 )
 from .dialogs import BalDialog
 from .widgets import BalCheckBox, BalLineEdit, BalSpinBox, BalTextEdit