Added build all task

[rjhancock]

Added build all task to build all 3 repos and copy the distribution files into a single folder within MHQ's build directory ./MekHQ/build/distributions

To run: ./gradlew buildAllPackages and wait for it to finish.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.31%. Comparing base (bd4954d) to head (e473b9f).
Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4471      +/-   ##
============================================
- Coverage     10.31%   10.31%   -0.01%     
  Complexity     5819     5819              
============================================
  Files           931      932       +1     
  Lines        128210   128228      +18     
  Branches      18870    18873       +3     
============================================
  Hits          13228    13228              
- Misses       113706   113724      +18     
  Partials       1276     1276              

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