Make the exporter take simulator data in count properly

Previously it failed to use the data in the right way. It should it now.
Make exporter work without sensor data as well
Unify 'anim' and 'render' to a single command, 'render'

Instead of having to swap between the commands, now you can just use the
following syntax:

./render <effect> <target> <frame>?

As you can see that 'frame' bit is optional. If skipped, it will render the
whole animation. Optional arguments defined earlier apply still.
path -> target
Merge commit 'f97ddcf42b9131912dab7629d9914ed8e1810e9a' into zcl-skeleton
Wrapping scroll_text, closes #103