Equalizer: use hardcoded values for now
GStreamerSharp: fix build (BpmDetector with gstreamer-sharp HEAD)
GStreamerSharp: use QueryCaps instead of Caps property (BpmDetector)

_query_caps is what the unmanaged backend uses
Visualization: Tracked it down to the line which is broken
GStreamerSharp: only audiosinkqueue breaks Vis
GStreamerSharp: fix visualization!
GStreamerSharp: progress on porting Visualization to be more similar to how it is in the unmanaged backend
GStreamerSharp: alright, only PCMHandoff missing!
GStreamerSharp: Fix playbin flags

In fact, Flags property correspond to Object flags property, not playbin one.