Qt Bluetooth and maybee serial support

Hi.

I just saw that Qt 5.3 was released and that contains bluetooth support, and that includes android too: http://qt-project.org/doc/qt-5/qtbluetooth-index.html

I think it would be awesome if we could add Qt Bluetooth support to libdivecomputer, and while where at it, maybe Qt Serial support to. We would probably build them as a default-off build option.

Do you think it would be a patch you can accept Jef?

At least one if the libdivecomputer based apps, Subsurface, is built with Qt and it would be a nice way to abstract it away. And it would probably help a bit in getting Subsurface more usable on Android.

//Anton