Antenna and mouth drawing works. But is hard coded in. This needs to be refactored to draw inputs more generally. Need some interface changes to creatures to allow it.
Prevent creatures moving backwards again.
Added line graphics primitive and UTs for it.
Made the interpeter draw lines for antenna.
Updated graphics FV test for black background.
Creatures can see colour.  Travis won't like this.
Fix UTs too.
Add unit test coverage for new tests.
UT fixes.
Creatures are displayed with the correct colour.
Movement degredation.
Merge branch 'colour-redux'