Implements \Stringable
Repository Harmonization
Correction missing default arg
Updated missing global imports
Harmonized phpmd
Correction dump inheritance interface 4
Correction dump interface inheritance 3
Harmonized pipeline
Correction dump interface inheritance 2
Correction dump interface inheritance
Correction interface management
Correction PossiblyNullReference
Updated to php7.1 and set up CI
Added newlines when dump is called
Correction of integer shift when getting nodes on negative indexes
Added dump function to nodes
Considering more values as meaningful for emptiness
Reworked attribute emptiness
Better management of emptiness recursivity