Debugger fix

[adam-urbanczyk]

• [x] Fix stopping
• [x] Change __file__ to smth more unique
• [x] Change __name__ to __cq_main__

[codecov[bot]]

Codecov Report

Merging #399 (79e07cc) into master (bf33b6d) will decrease coverage by 0.39%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
- Coverage   88.93%   88.55%   -0.39%     
==========================================
  Files          19       19              
  Lines        1537     1546       +9     
  Branches      185      187       +2     
==========================================
+ Hits         1367     1369       +2     
- Misses        137      143       +6     
- Partials       33       34       +1     

Impacted Files	Coverage Δ
cq_editor/widgets/debugger.py	81.16% <75.00%> (-1.08%)	:arrow_down:

... and 1 file with indirect coverage changes

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