Merge pull request #16 from aoblet/game

Game
add json to project in cmake for tests visualisation
update cause of bug link compile runtime
update m_light_list to public for ease
read load json tests ok, not on game yet
Merge pull request #17 from aoblet/load-save-json

Load save json
test on game + add functionality fastWriter: less memory for json file
Merge pull request #18 from aoblet/load-save-json

test on game + add functionality fastWriter: less memory for json file
fix bug loadImage condition
fix bug condition while adding cube
add -g option: more readable for debug
add GameUtilities: cleaner for setUp game