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* Rename test variable and fix outdated docstring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

tests/reference/baseConfig_novelwriter.conf

@@ -1,5 +1,5 @@
 [Main]
-timestamp = 2021-02-15 16:31:24
+timestamp = 2021-08-17 20:59:39
 theme = default
 syntax = default_light
 icons = typicons_colour_light
@@ -10,7 +10,6 @@ lastnotes = 0x0
 guilang = en_GB
 hidevscroll = False
 hidehscroll = False
-fullstatus = True
 
 [Sizes]
 geometry = 1200, 650
@@ -27,6 +26,8 @@ fullscreen = False
 [Project]
 autosaveproject = 60
 autosavedoc = 30
+fullstatus = True
+emphlabels = True
 
 [Editor]
 textfont = None