EVE-O Preview.json location

[wvdvegt]

The location of EVE-O Preview.json (which is generated when closing the app) prevents installing it under program files (as these folders are no longer writeable. Even if you manage to save something there at all it's virtualized).

The correct location would be in an app specific folder (eve-o-preview for example) under %appdata%, %localappdata% or in c:\progamdata (choice depends a bit on the type of installation, per user or per machine).

[feyyd]

Rewrote the version I posted here and created an official pull request.

#17