Fixed issue #376

[Tingvall]

Me and Richel got it to work on mac, that is the new stuff. Ignore in review.

[richelbilderbeek]

@Tingvall: I do agree that the .pro files can be ignored in the review, but the #ifdef USE_MACs should be removed before merging to develop I think. Who wrote that in the first place :smirk:?

[codecov-commenter]

Codecov Report

Merging #438 (4cca3f2) into develop (1209f73) will increase coverage by 0.82%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #438      +/-   ##
===========================================
+ Coverage    93.02%   93.84%   +0.82%     
===========================================
  Files           44       44              
  Lines         2195     2504     +309     
  Branches       128      149      +21     
===========================================
+ Hits          2042     2350     +308     
- Misses         153      154       +1     

Impacted Files	Coverage Δ
main.cpp	94.82% <ø> (ø)
menu_button.h	100.00% <ø> (ø)
read_only.cpp	100.00% <100.00%> (ø)
read_only.h	85.71% <100.00%> (-14.29%)	:arrow_down:
game.h	100.00% <0.00%> (ø)
game.cpp	95.89% <0.00%> (+1.55%)	:arrow_up:

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[kausmees]

We removed one of the functions, and renamed the other one get_value(). And changed the return to a const reference. Also removed the preprocessor #ifdef USE_MAC directives from all files, and it worked when we tested on a mac!