made a more streamlined method of passing attributes from world to robots
added back in the icon attribute for robots, currently just the char of their idx
updated arena-text-grid so it works now.
got terminal animation almost working, without being able to set frame rate
got a little reporting of position going for animation screen
removed :icon from robot attributes; not related to anything except display
fixed rounding error causing some robots not to display in the text-output arena
altered name and docstring for the function tying a world sequence to its tick-time
spruced up display of frames per second in animate
fixed robot :pos-x and :pos-y generation, so they're floats
formatted lines in display to 1 decimal point
got animation timing working
added some attributes to be printed during animation
got :moving-to-spot test working, refactored test-programs a bit