Refactor HLListWidget setupKeyBindings
Rename HLRepeatingKeyBinderForWidget to HLRepeatingKeyBindingHandler.
instvar
  keysWithActions to keyBindings
class method
  newWithWidget: to forWidget:
methods
  whileKeyPressed:doAction: to whileKeyPressed:do:
  resetKeypressActive to handleKeyUp
`self._value()` when `self()` was before
`_st(self)` replaced with `self` in Test.js
Merge pull request #509 from herby/test-js-recompiled-with-optimized-self

`_st(self)` replaced with `self` in Test.js
Merge pull request #508 from herby/self-called-using-value

`self._value()` when `self()` was before; fixes #459
Merge pull request #507 from rcsimm/helios-sunit

Refactor HLListWidget setupKeyBindings