v0.1.2

Changed

• The floating button can be dragged anywhere on screen and stays where you put
  it. Pinned to the bottom end corner it kept landing on top of controls
  underneath and swallowing taps meant for them. The position is stored as a
  fraction of the free space, so it holds its relative place across rotation and
  screen sizes, and it is clamped so the control is always fully visible,
  including when expanding makes it taller near an edge.