Make sure theta axis type float

[AdvancedImagingUTSW]

And some misc code cleanup along the way.

Eliminate the original tiling_wizard_controller, since we have not been using this for a while.

Rename second tiling_wizard_controller (e.g., remove the 2 at the end).

Some minor changes in formatting.

[codecov]

Codecov Report

Attention: Patch coverage is 81.55340% with 19 lines in your changes missing coverage. Please review.

Project coverage is 51.78%. Comparing base (6f05134) to head (397485f).

Files	Patch %	Lines
...roller/sub_controllers/tiling_wizard_controller.py	80.80%	19 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #924      +/-   ##
===========================================
+ Coverage    51.42%   51.78%   +0.36%     
===========================================
  Files          180      179       -1     
  Lines        19248    19110     -138     
===========================================
- Hits          9899     9897       -2     
+ Misses        9349     9213     -136     

Flag	Coverage Δ
unittests	51.78% <81.55%> (+0.36%)	⬆️

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