Changed how the x offset of onroad objects is calculated so that they
can be centered correctly.
Also made offset values be pre-determined to save the check in the
render loop.
Added support for marker objects.
Changed painting of start and finish line to be defined by marker
objects.
Added trigger actions for complete level and stop player.
Added property to disabled collision.
Changed the way how enabler controls works so that controls logic is
still executed but not allowing player input.
Published demo builds.