Fix, tidying, and some testing

Fix #39 Loading the config file again removes the directories from the sources
Fix #33 Parity device size warning is misleading

• Improve text for the "Full sync" button
• Fix Warn log colouring
• Add Horizontal size for listbox items
• Add Launch Wordpad for current config file
• Improved Cannot Add message
  Test #26 "z-parity" is not catered for.
• Add ChangeLog menu back
• Move code to the menu handler region