More efficient FeatureManagerBuilder

[MarkRx]

Fixes #966 by avoiding creating unused defaults

[codecov-commenter]

Codecov Report

Patch coverage: 72.72% and project coverage change: -0.03 ⚠️

Comparison is base (0e08e5b) 55.84% compared to head (62340c7) 55.81%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #971      +/-   ##
============================================
- Coverage     55.84%   55.81%   -0.03%     
- Complexity      914      917       +3     
============================================
  Files           178      178              
  Lines          4502     4506       +4     
  Branches        592      596       +4     
============================================
+ Hits           2514     2515       +1     
- Misses         1826     1827       +1     
- Partials        162      164       +2     

Impacted Files	Coverage Δ
...org/togglz/core/manager/FeatureManagerBuilder.java	75.60% <72.72%> (-5.48%)	⬇️

... and 1 file with indirect coverage changes

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[bennetelli]

Thank you very much for your PR :)