Navigation bar indicates which button is in play

[xuey0ng]

#Closes #72

[codecov-io]

Codecov Report

Merging #150 into master will decrease coverage by 0.31%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #150      +/-   ##
============================================
- Coverage     46.10%   45.79%   -0.32%     
  Complexity      703      703              
============================================
  Files           119      119              
  Lines          2915     2935      +20     
  Branches        396      396              
============================================
  Hits           1344     1344              
- Misses         1402     1422      +20     
  Partials        169      169              

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/chopchop/ui/DisplayController.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

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[zhiayang]

👍