Fifth Release

This is an important bug fix release:

• Upgraded to the latest stable v12.0.3 of nw.js, fixing a number of bugs in the process, including one that prevented v0.0.4 from being used successfully under Windows
  • Bugs fixed: #66, #65, #61, #57, #53, #52
• Added a warning about disrupting the backstage wiki
• Switched to using "Settings" instead of "Control Panel", to reduce confusion with TiddlyWiki's control panel
• Updated app icon
• Cleaned up TiddlyWiki build products, fixing #67