Add option for sending feedback only if ReaLearn track armed

[Benjamin Klum]

Because usually it doesn't make sense if the control direction is disabled (track unarmed) but the feedback is enabled.

Enable it by default for completely new presets.

[Benjamin Klum]

re #91 Don't send feedback when ReaLearn track not armed

→ <<cset e2dabc166982>>

[Benjamin Klum]

re #91 Introduce "Send only if track armed"

Attention: If ReaLearn is on input FX chain and track is not armed, it currently can't send feedback anyway because REAPER doesn't call the process double replacing method

→ <<cset dd2660803f9a>>