GUI and code tweaks and fixes (#852)

* Improve format menu header descriptions
* Ensure that item status is parsed after item class from XML
* Fix column alignment in ToC.txt file
* Rename test variable and fix outdated docstring
* Fix ToC.txt underline
* Rename the Layout label on the item details panel
* Add option to emphasise H1 and H2 labels in the project tree
* Rename the main column of the novel tree to match project tree
* Use the same document icons in the outline as the project tree
* Move project tree settings to Project section of config file

nw/gui/noveltree.py

@@ -64,7 +64,7 @@ class GuiNovelTree(QTreeWidget):
         self.setIndentation(iPx)
         self.setColumnCount(3)
         self.setHeaderLabels([
-            self.tr("Title"),
+            self.tr("Novel Outline"),
             self.tr("Words"),
             self.tr("POV")
         ])