Sc209/dropdown menus

• Made a class of the review window in the View
• The drop down menu in the review window has now all ShadowTasks (aka trials) which you can view. Really nice. No functionality yet.
• Fixed some things that were ugly. For example, I added underscores to some variable names. Maybe some argue that all the underscores are ugly, but it makes the file way more readable and now the IDE does not complain any more about spelling mistakes.

umbra/view.py

@@ -297,7 +297,6 @@ class View:
         # Interactive elements
         self._create_combobox('file {}'.format(type_code),
                               frame,
-                              type_code,
                               2, column)
         self._create_button('select {}'.format(type_code),
                             frame,
@@ -379,14 +378,13 @@ class View:
 
         add_to_dict(key, radio, self._elements)
 
-    def _create_combobox(self, key, frame, type_code, row, column):
+    def _create_combobox(self, key, frame, row, column):
         """Create combobox, a drop-down file selection widget.
 
         Args:
             key: Key to save button in _elements dictionary
             frame: Frame into which to place the button
             column: Column in grid to place the button in
-            type_code: Role of combobox ('source' or 'shadow')
 
         Raises:
             ValueError: Key already exists
@@ -475,7 +473,7 @@ class View:
         self._create_label('review_title', pop_up, 'Review marked mistakes',
                            0, 0, False)
         self._create_label('review_label', pop_up, 'File: ', 1, 0, False)
-        self._create_combobox('review_box', pop_up, '', 1, 1)
+        self._create_combobox('review_box', pop_up, 1, 1)
 
         # Is the save functionality here equal to the other save button?
         self._create_button('save_review', pop_up, 'Save', 2, 0)