breaking: remove old dispatcher

[njzjz]

Remove the old dispatcher and all related tests and examples.
Fix #1002. Close #522.

[codecov-commenter]

Codecov Report

Base: 39.55% // Head: 46.06% // Increases project coverage by +6.51% 🎉

Coverage data is based on head (003cd2a) compared to base (ed26994).
Patch coverage: 20.68% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1097      +/-   ##
==========================================
+ Coverage   39.55%   46.06%   +6.51%     
==========================================
  Files          99       82      -17     
  Lines       17981    14452    -3529     
==========================================
- Hits         7112     6658     -454     
+ Misses      10869     7794    -3075     

Impacted Files	Coverage Δ
dpgen/auto_test/common_equi.py	63.75% <0.00%> (+0.60%)	⬆️
dpgen/auto_test/common_prop.py	38.81% <0.00%> (+0.10%)	⬆️
dpgen/remote/decide_machine.py	87.50% <ø> (-4.50%)	⬇️
dpgen/simplify/simplify.py	0.00% <0.00%> (ø)
dpgen/data/gen.py	51.75% <11.11%> (+0.35%)	⬆️
dpgen/generator/lib/run_calypso.py	10.24% <25.00%> (+0.21%)	⬆️
dpgen/generator/run.py	65.20% <28.57%> (+0.14%)	⬆️
dpgen/dispatcher/Dispatcher.py	84.21% <50.00%> (+43.66%)	⬆️
dpgen/arginfo.py	100.00% <100.00%> (ø)
... and 1 more

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