Format players' names (URL : 'xml_liste_joueur_o'), trim sets details, and add two Joueur() properties

[StephSako]

This PR has several goals:

• Add unit tests covering the function testListJoueursByClub() (URL : 'xml_liste_joueur_o'),
• Add two properties to /Model/Player and convert the numeric fields into int value,
• Enrich unit tests of the recovery of a match with badly formatted players in the list of club's players,
• Format/trim player names directly at the creation of Model/Player class instances rather than during the creation of /Rencontre (else, information is not retrieved),
• As the accents are now well encoded in the response, there is no longer a need to remove accentuation on players' names at match recovery (else, information is not retrieved).
• Don't add a 'ghost' player in RencontreDetails if he's forfeit, and return a players list empty array if the whole team is forfeit, instead of an array with only a ghost player.
• Trim sets details in RencontreDetails ('ghost' set added instead),
• Format the scores of the sets into int type