Save tox data to the right location in %appdata%

See also:
https://github.com/Tox/Tox-STS/blob/master/STS.md#client-pathsformats
Well I messed that up...
Updated README.md with some new screenshots
Added tox data portability
Some more check for tox data
Added an 'export' button (for Tox data)
Delete the notifyicon on closing
Prevent Toxy from showing up in the alt-tab menu

(when minimized to tray)
Merge remote-tracking branch 'origin/master' into av
Tray left click will now hide Toxy closes #12
Added ApplicationIcon fixes #13
Minor changes to the video window
Using MahApps.Metro 0.14.0.0 from now on
Forgot to change the version here...
Fixed notifyicon mouse interaction. Fixes #14
Messages are readable again in BaseDark. Fixes #15
Using a better regex for url parsing. Fixes #16
Merged master into av and fixed any conflicts
Added drag and drop file uploads
Added confirmation dialog when drag and drop occurs