Alias implementation to the innmind/time one

[Baptouuuu]

Fix Innmind/TimeContinuum#26

Internal classes have been deleted, as no one should have referenced them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a46091e) to head (17b7122).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@               Coverage Diff               @@
##             develop       #19       +/-   ##
===============================================
+ Coverage      71.53%   100.00%   +28.46%     
===============================================
  Files             10         4        -6     
  Lines            130        45       -85     
===============================================
- Hits              93        45       -48     
+ Misses            37         0       -37     

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