Unicode-safe handling of the data dir

Unicode data dirs will still fail, though, because FC does not handle
the path in a unicode-safe manner.
Forbid webview from navigating to a URL not at localhost
Merge branch 'develop' of github.com:BitShares/qt_wallet into develop
Merge branch 'master' into develop
Merge branch 'develop' into btsx
Open forbidden links in external browser
Merge branch 'develop' of github.com:BitShares/qt_wallet into develop
Meh
Revert "Rewrite rules for copying resource files to the build directory to try to make them work on unix as well as windows (only tested for windows out-of-tree builds, but cmake is cross-platform, right?)"

This reverts commit 6cb3742a3d1e2ac896a018bc1d93bea2e2927390.
Add OS notification for incoming emails
Merge branch 'develop' into btsx