Add basic visualization capacity

[JonathanPetit]

Sorry, i made a bad rebase on #22, so i tried to resolve them but it didn't work.. This is the new PR for the #16!

• [x] Add basic visualization structure
• [x] Add svg rendering
• [x] Rectangle shape
• [x] Circle shape
• [x] Line shape

[JonathanPetit]

@charlesvdv an other review to see if it's good! After that, we can merge this PR before it's too big! The tests wiil be add in the next PR.

[JonathanPetit]

Example of basic svg visualization (/visualization/bin/svg-example.cpp)