audio/din: Update to 56

Changes since 55:

DIN Is Noise 56:

  /*
    new drone movements: rail and strafe

      rail moves a drone along its velocity vector
      strafe moves a drone lateral (perpendicular) to the velocity vector

        access rail and strafe using Drone Tools > Move / Rail / Strafe option list
          click on the option to activate
          then just move mouse up or down to rail or strafe

      interesting fx possible if the drone velocity vectors are
      auto rotating / flipping / pausing when railing or strafing!
  *\

  /*
      new auto pause for auto rotating drone velocity and/or accleration vectors

      basically, pause rotating every few seconds for a few seconds
        set values of 'every few seconds' and 'for a few seconds' from:
          Drone Params > Defaults for new drones OR
          Drone Params > Motion for existing drones
  *\

  /*
      new auto flip (= change direction of) rotation of curves on
      any curve editor
  *\

  /*
    new Curves tab on Menu of all curve editors
      lists curves available for editing
      can turn on/off curves for better/easier & targeted editing
  *\

  * improved FFT display and handling on waveform editors
  * improved waveform display on keyboard-keyboard
  * improved auto flip of rotation of velocity/acceleration vectors of drones
  @ launched drones from muted drones are not muted (default until DIN55)
    @ they serve no purpose, you can just select the launcher and
      stop launching :)
  - Fractaliser does not change curve name on apply
  ! fixed Menu > Drone tools > Immortalize to turn mortal launched drones immortal
  ! fixed resizing of Sine_Mixer harmonics/phases widget when moving Sine_Mixer

(fox)