Fixing bugs in v0.13.0b1

Fixes:

• Settings directory wasn't created automatically causing crashes
• Autosubnavigation failed for certain pages
• The lock to stop the live editor building twice if multiple files have changed was getting left on if an python exception was raised
• Config editor couldn't add subnavigation to certain navigation items
• Failing to load partlist to editor for partlink modal on pages in root dir
• Edit button scrolls to text in chromium browsers