Improve usage of class 'Ref'

[grospelliergilles]

• Add helper method createRef() to create an instance of type T and return a Ref<T>.
• Add conversion from Ref to bool.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fb0b86a) 72.20% compared to head (3bb02f8) 72.20%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1161   +/-   ##
=======================================
  Coverage   72.20%   72.20%           
=======================================
  Files        2030     2030           
  Lines      148222   148253   +31     
=======================================
+ Hits       107018   107042   +24     
- Misses      41204    41211    +7     

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