PVR: Fix stopping when station timeline is open and user presses stop
Merge pull request #3118 from fritsch/pvr-fix-timeline-crash

PVR: Fix stopping when station timeline is open and user presses stop
Fixed some warnings when compiling using -O2
Merge pull request #3110 from popcornmix/volumeloss

[rbp/omxplayer] Avoid loss of volume messages
Merge pull request #3109 from popcornmix/contiguousaudio

[rbp/omxplayer] Fix check for contiguous audio buffers
[rbp/omxplayer] Handle displaytime more like dvdplayer

We had various glitches when mixing seeking and trickplay with online streams or dvd content.
This tries to match more closely what dvdplayer does and fixes some seek/trickplay jumping issues