Génération de MIPS avec le code intermédiaire

See merge request !9

Instruction bison

See merge request !8

Ajouter les tests de Ketterlin dans nos tests

See merge request !7

Those weird MIPS were caused by bad memory access, as arg.value is
negative when it represents a global variable.

feat(mips): add everything needed but get weird mips (null, symbols due to illegal memory access?, empty operands)