Partialy connected pipelines

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GStreamer would stop with an error, if one pushes on or pull from an unconnected pad.

We can address this is several ways:

  1. set locked state on sources that have no link to master
  2. terminate all elements with fakesrc/fakesink
  3. only actually add elements to the pipeline for real once we connect them

See lots of comments in machine.c

scenario description
unconnected generator
WARN basesrc gstbasesrc.c:2330:gst_base_src_loop:<simsyn 00_0x8446b98> error: Internal data flow error.
WARN basesrc gstbasesrc.c:2330:gst_base_src_loop:<simsyn 00_0x8446b98> error: streaming task paused, reason not-linked (-1)
WARN bt-edit main-toolbar.c:274:on_song_error: Internal data flow error. gst_base_src_loop (): /GstPipeline:song/GstBtSimSyn:simsyn
unconnected effect no problem. Also multiple of those are fine
unconnected master we don't start playback right now.
unconnected effect + master
WARN   adder gstadder.c:537:forward_event_func:<adder_0x8446a28:sink3> Sending event  0x866d400 (seek) failed.
WARN bt-core song.c:469:on_song_state_changed: bin failed to handle seek event
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