Reduce circular references

[Baptouuuu]

Problem

Same as Innmind/framework#3

Solution

Same as Innmind/framework#3

Note

There are remaining closures that still capture $this but they should be directly evaluated, meaning the reference is short lived. This should not cause any problem.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (076be6f) to head (0a2d5a2).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #40      +/-   ##
=============================================
+ Coverage      97.33%   97.39%   +0.06%     
- Complexity       634      635       +1     
=============================================
  Files             96       96              
  Lines           4236     4337     +101     
=============================================
+ Hits            4123     4224     +101     
  Misses           113      113              

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