Improvements for Control library

[hawkkiller]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.13043% with 24 lines in your changes missing coverage. Please review.

Project coverage is 50.25%. Comparing base (7905647) to head (2194134).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/handlers/droppable_controller_handler.dart	46.66%	8 Missing ⚠️
...ib/src/handlers/sequential_controller_handler.dart	85.41%	7 Missing ⚠️
lib/src/core/controller.dart	85.29%	5 Missing ⚠️
...ib/src/handlers/concurrent_controller_handler.dart	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   51.65%   50.25%   -1.41%     
==========================================
  Files           8        8              
  Lines         422      390      -32     
==========================================
- Hits          218      196      -22     
+ Misses        204      194      -10     

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[koutja]

@hawkkiller resolve conflicts pls