Make GlobeGPS a dummy on android
Disable usermanual on android
Stub out the printing support on android
Introduce android specific file
Make dc_number defined when using it

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Add forward declaration of QSettings

Its needed for Qt5

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Translate using tr() to be Qt5-compatible

There are no utf8 in those strings, and we can translate them as
everything else with tr() instead.
QApplication::UnicodeUTF8-part is deprecated and removed in Qt5.

Signed-off-by: Anton Lundin <glance@acc.umu.se>