Add the 'reach' setting (previously known as 'detection')

[LewisGaul]

Implements #33

• Update the get_nbrs() method
• Add the UI menubar
• Pass the new parameter through everywhere it's needed
• Handle disabling reach in split-cell mode
• Bump the highscores DB version and implement compat
• Support in the bot and server (untested)
• Get existing tests passing
• Add tests
• Update python version for testing with, fix black/isort formatting

[codecov]

Codecov Report

Attention: 39 lines in your changes are missing coverage. Please review.

Comparison is base (814f300) 69.50% compared to head (6e25c54) 69.82%.
Report is 1 commits behind head on dev.

Files	Patch %	Lines
src/minegauler/app/highscores/sqlite.py	41.17%	10 Missing ⚠️
src/minegauler/app/frontend/main_window.py	65.21%	8 Missing ⚠️
src/minegauler/app/highscores/compat/sqlite_v2.py	50.00%	7 Missing ⚠️
src/minegauler/app/core/split_cell/controller.py	50.00%	4 Missing ⚠️
src/minegauler/app/frontend/state.py	69.23%	4 Missing ⚠️
src/minegauler/app/highscores/compat/__init__.py	33.33%	2 Missing ⚠️
src/minegauler/app/shared/utils.py	87.50%	2 Missing ⚠️
src/minegauler/app/core/engine.py	83.33%	1 Missing ⚠️
src/minegauler/app/core/regular/board.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #211      +/-   ##
==========================================
+ Coverage   69.50%   69.82%   +0.32%     
==========================================
  Files          44       45       +1     
  Lines        3879     3994     +115     
==========================================
+ Hits         2696     2789      +93     
- Misses       1183     1205      +22     

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