Per-action settings

[taye]

Interactable#<actionable>({ <setting>: { ... } })

For example:

interact(target)
.draggable({
  restrict: {
    restriction: 'parent',
    elementRect: { top: 0, left: 0, bottom: 1, right: 1 },
    endOnly: true
  },
   snap: {
    enabled: true,
    mode: 'grid',
    grid: { x: 10, y: 10, range: 50 }
  }
}).resizable({
  restrict: {
    restriction: 'parent',
    elementRect: { top: 1, left: 1, bottom: 1, right: 1 }
  },
  snap: { enabled: false }
})

Backwards compatibility with the old Interactable#<setting>({ ... }) is roughly maintained.

interact#<setting>(...) has been removed.

Closes #87