[Maintenance] add JuliaFormatter and remove acronyms

[odow]

No functionality change, just:

• Added copyright headers
• Replaced acronyms
• Ran JuliaFormatter

[codecov]

Codecov Report

Patch coverage: 81.10% and project coverage change: -0.37% ⚠️

Comparison is base (90ddf43) 80.70% compared to head (c25e9de) 80.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   80.70%   80.33%   -0.37%     
==========================================
  Files           9        9              
  Lines         513      534      +21     
==========================================
+ Hits          414      429      +15     
- Misses         99      105       +6     

Files Changed	Coverage Δ
src/moi/nlp.jl	95.00% <50.00%> (ø)
src/moi/util.jl	57.69% <65.21%> (-6.14%)	⬇️
src/moi/variables.jl	85.71% <69.23%> (-6.29%)	⬇️
src/MOI_wrapper.jl	65.11% <71.42%> (ø)
src/util.jl	84.68% <80.00%> (+0.03%)	⬆️
src/moi/results.jl	62.31% <85.71%> (+1.20%)	⬆️
src/BARON.jl	100.00% <100.00%> (ø)
src/moi/constraints.jl	97.50% <100.00%> (+0.62%)	⬆️
src/moi/objective.jl	94.11% <100.00%> (+0.78%)	⬆️

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