Use custom ImageButton for repeated longclick triggering

This slowly lets use seek into a particular direction if the button
is pressed for a longer duration.
Don't start radio on longclick

Starting the receiver takes some time, so the repeated seeking events
pile up. This is simply too messy...
Merge pull request #2 from GenetICS/master

Add Turkish translations
Effem: Add wiredheadset / loudspeaker option for output

Change-Id: Ifeed783f5c216dbfd85b3e3ab6cfcd9a99001d90