separate cli and gui application in own python packages. provide database schema as python package.

python/kontor-gui/gui/progress.py

@@ -0,0 +1,18 @@
+from PySide6.QtWidgets import QProgressBar
+
+
+class ProgressUpdate:
+    def __init__(self, progress: QProgressBar):
+        self.start = 0
+        self.end = 0
+        self.current = 0
+        self.progress = progress
+
+    def start(self, start_value, end_value):
+        self.start = start_value
+        self.end = end_value
+        self.current = start_value
+        self.progress.update()
+
+    def update(self, current):
+        self.progress.update()