Cleanup pom: compiler and encoding are managed via flags making maintenance easier and other plugins do use those flags too

[hazendaz]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.27%. Comparing base (3234238) to head (8e66077).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1167   +/-   ##
=========================================
  Coverage     98.27%   98.27%           
  Complexity      565      565           
=========================================
  Files            55       55           
  Lines          1214     1214           
  Branches        105      105           
=========================================
  Hits           1193     1193           
  Misses           10       10           
  Partials         11       11           

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