Merge Novel Layouts (#837)

* Merge novel layouts and simplify the Tokenizer class
* Fix core tests
* Delete auto-layout code
* Remove no longer needed item layouts
* Remove references to deleted item layouts in test
* Make some minor changes to Tokenizer class and update tests
* Update test reference files
* Update sample project
* Fix a few issues with the Tokenizer
* Centre some text in the sample documents
* Make some minor changes to how new projects are generated
* Add support for New Page and VSpace commands to the Tokenizer
* Remove Title and Page layouts and add codes for page break and vertical space
* Add document layout and fix some issues in index class with new title formats
* Update tests and reference files
* Bump the project file version and fix a minor issue in items class
* Update tests and test coverage
* Clean up some warnings and issues in tests

tests/reference/guiBuild_Tool_Step4M_Lorem_Ipsum.json

@@ -5,12 +5,12 @@
     "authors": [
       "lipsum.com"
     ],
-    "buildTime": 1601120788
+    "buildTime": 1627867578
   },
   "text": {
     "nwd": [
       [
-        "# Lorem Ipsum",
+        "#! Lorem Ipsum",
         "",
         "",
         "",
@@ -21,10 +21,11 @@
         "",
         "",
         "",
+        "",
         ""
       ],
       [
-        "## Prologue",
+        "##! Prologue",
         "",
         "% Synopsis:Explanation from the lipsum.com website.",
         "",
@@ -147,4 +148,4 @@
       ]
     ]
   }
-}
+}