GUI refactoring to make it more readable and easier to maintain

Everything is documented at https://www.notion.so/qim-dtu/GUI-base-classes-e8a5b71eb414485d8cc03b137bb42087

qim3d/gui/annotation_tool.py

@@ -41,7 +41,7 @@ class Interface(BaseInterface):
                  img = None):
         super().__init__(title = "Annotation Tool", 
                          height = 768, 
-                         width = None, 
+                         width = "100%", 
                          verbose = verbose)