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

nw/gui/docviewer.py

@@ -187,6 +187,7 @@ class GuiDocViewer(QTextBrowser):
             logger.error("Failed to generate preview for document with handle '%s'", tHandle)
             nw.logException()
             self.setText(self.tr("An error occurred while generating the preview."))
+            return False
 
         # Refresh the tab stops
         if self.mainConf.verQtValue >= 51000:
@@ -208,7 +209,9 @@ class GuiDocViewer(QTextBrowser):
             theCursor.insertText("\t")
 
         if self._docHandle == tHandle:
+            # This is a refresh, so we set the scrollbar back to where it was
             self.verticalScrollBar().setValue(sPos)
+
         self._docHandle = tHandle
         self.theProject.setLastViewed(tHandle)
         self.docHeader.setTitleFromHandle(self._docHandle)
@@ -539,6 +542,9 @@ class GuiDocViewer(QTextBrowser):
             ".synopsis {{"
             "  color: rgb({mColR}, {mColG}, {mColB});"
             "}}\n"
+            ".title {{"
+            "  text-align: center;"
+            "}}\n"
         ).format(
             tColR=self.theTheme.colText[0],
             tColG=self.theTheme.colText[1],