add threading to applying

gui/apply_worker.py

@@ -0,0 +1,29 @@
+from PySide6.QtCore import Signal, QThread
+from PySide6.QtWidgets import QMessageBox
+
+class ApplyAlertMessage:
+    def __init__(self, txt: str, title: str = "Error!", icon = QMessageBox.Critical, detailed_txt: str = None):
+        self.txt = txt
+        self.title = title
+        self.icon = icon
+        self.detailed_txt = detailed_txt
+
+class ApplyThread(QThread):
+    progress = Signal(str)
+    alert = Signal(ApplyAlertMessage)
+
+    def update_label(self, txt: str):
+        self.progress.emit(txt)
+    def alert_window(self, msg: ApplyAlertMessage):
+        self.alert.emit(msg)
+    
+    def __init__(self, manager, resetting: bool = False):
+        super().__init__()
+        self.manager = manager
+        self.resetting = resetting
+
+    def do_work(self):
+        self.manager.apply_changes(self.resetting, self.update_label, self.alert_window)
+
+    def run(self):
+        self.do_work()