Pillar 2.0.0: Introduction of PetitPillar

Hi everyone! Yes, a new version of Pillar, again! With this version we removed the old parser of Pillar to introduce PetitPillar base on PetitParser. This parser is slower than the previous one but we will be able to improve his speed. We will also be able to improve Pillar at the parser level, which was impossible before. So we will be able to remove some hacks and improve the experience of the users. If you are good in parser and you want to contribute to his improvement, feel free to help, we have a lot of tests to help. This is my first parser so I am sure it have a lot of rooms for improvement. -- Cheers Cyril