really fix #2 - adjusting was not set to true in dragging. We needed a
method that adjusts multiple parameters while firing only once. This
makes a version bump necessary.
proper vertical position of dual range slider track rect
do away with the automatic rangeLo/Hi coercion. That is, `range` may
  have `_1 > _2`. Instead there are `rangeLo` and `rangeHi` methods now.
  This allows better interaction with LucreSwing.
add rotary know from SwingOSC
fixes #3 - by exchanging the font. adds rotary knob. makes it v1.5.0