WIP add equalizer
Created by: wdehoog
Adds the gstreamer 10 bands equalizer see here.
Can be controlled using dbus:
dbus-send --session --print-reply --type=method_call --dest=core.ubuntu.media.Service /core/ubuntu/media/Service core.ubuntu.media.Service.EqualizerSetBand int32:8 double:0
dbus-send --session --print-reply --type=method_call --dest=core.ubuntu.media.Service /core/ubuntu/media/Service core.ubuntu.media.Service.EqualizerGetBands
Only works and tested with audio.