Resolve "[Studio] Pouvoir ajouter des sources de données de type API externe"

client/javascript/externs/formReader/formReaderCtrl.js

client/javascript/externs/formReader/formReaderSrvc.js

client/javascript/externs/jmespath/jmespath.js

client/javascript/externs/jmespath/jmespath.min.js

...t/javascript/externs/studio/javascript/app/FormBuilder.js

client/javascript/externs/studio/lang/lang-en.json

client/javascript/externs/studio/lang/lang-fr.json

client/javascript/externs/studio/templates/MainTemplate.html