Schelling: Separate text-only viz into run_ascii.py

[rht]

This partially addresses #693.

The text-specific viz is moved to run_ascii.py, and so it'd be less confusing to read run.py.

[coveralls]

Coverage remained the same at 76.989% when pulling e86ce30 on rht:schelling-text into aa81374 on projectmesa:master.

[dmasad]

This looks good, though it looks like the functionality in TextGrid was broken at some point (since it was largely not in use). I'm going to approve, and then quickly add a fix.

[rht]

This was the final grid's output when I executed run_ascii.py:

Step: 9
XXXXXXXXXXXXX XXXXXX
XXXXXXXXXXXXXXXX XXX
XXXXX XXXXXXX  X XX 
 XX XXXXXXXXXX XXXX 
XXXXXXXXXXXXXXX XXXX
 XXXXX XXXX XX X XXX
XX  X XXXXXXXXXXXXXX
 XXX XXX XX XXXXXXX 
X XXXXX X XXXX X  XX
XXXXXXXXXXXXXXXXXXXX
XXXXXXX XXXXXX  XXXX
X XX  XX XXXX XX   X
   X  X XXXXXXXXXX X
XX XXXXXXXXXX  XXX X
XXXXXXXX  X XXXX  XX
X X XXXXXXX   XXXX X
XXXXXXXXXXXXX  XX XX
  XXXXXXX XXXX  XX X
X X XXXXXXXXXXXXXXXX
XX XXXXXXXXXX X XXXX

happy: 309
---

The O's aren't being printed out.

[dmasad]

Yup, there was a problem with TextGrid. It was a one-line fix so I pushed it directly to master.

[guy1ziv2]

I am still getting only 'X' or ' ' with TextGrid, even when the converter is not supposed to print 'X' at all cases... I am trying to use TextGrid to visualize Conways Game of Life port in a Colab environment see https://colab.research.google.com/drive/1GJiWioQWk6Z3YnMdu-ZXDYUQs03O2eqN

[dmasad]

@guy1ziv2 The new fix is just on GitHub at the moment, and the version on PyPI hasn't been updated yet. If you want to makes sure you're installing the most recent version, you need to pip-install directly from GitHub, i.e.

!pip install git+https://github.com/ProjectMesa/mesa.git