v0.2.4.2

- Dropbox integration now better. Clicking link or unlink buttons will
now update the option on the settings menu.
- Saving now done on background thread. When started, saving overlay
appears and changes to "Finished" when done.
- Picker lists now have smaller font so more of each item is visible.
Helpful on lists like ammo/firearm manufacturers, ammo/firearm
selectors on Range Log form.