Support VectorQuadraticFunction objectives

[odow]

Closes #43

[codecov]

Codecov Report

Base: 95.86% // Head: 95.89% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (9d22ae7) compared to base (b798d58).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   95.86%   95.89%   +0.03%     
==========================================
  Files           8        8              
  Lines         725      731       +6     
==========================================
+ Hits          695      701       +6     
  Misses         30       30              

Impacted Files	Coverage Δ
src/MultiObjectiveAlgorithms.jl	90.62% <100.00%> (+0.30%)	⬆️

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