addons: add configure option
demux: ogg: fix seeking bounds search

Might not have found lowest granule for vorbis/opus like codecs.
demux: ogg: fix empty page bug after seek

pagein() can't reload the same page, and will
append its packet on next valid pagein() call.
demux: ogg: theora: prevent zero frame rate

Disables VP3 based video tracks and allows
playback of other tracks without PCR pollution.
And fix some overflows.