[enh] Cordova build hooks now use the project gulpfile (sse task cdvAfterPrepare)

[enh] Add cordova plugin customurlscheme
[enh] Prepare hook to next Android project layout
[enh] Add --debug option gulp tasks

[fix] fix i18n JSON (EO)
[fix] Minor JS changes (use some '===' comparator)
[fix] Fix dev doc

[fix] Wot Map: hide buttons on small screen (in marker popup)

Petites corrections linguistiques (déjà OK sur https://git.duniter.org/documents/licence-g1/-/blob/master/license/license_g1-fr-FR.rst)

Mise à jour version 1.6.7 : intégration du mode démo + conservation données de navigation + amélioration de certaines traductions

[fix] Readonly mode: hide user menu items, in small device
[fix] Help tour: Fix last help tour message, on readonly mode
[fix] Help: HIde login/join help entries, on readonly mode

[fix] Demo mode: add ribbon on home page. Fix warn template use
[fix] API: allow to pay using the API, but display a warn message

[fix] Fix i18n ES json format

[fix] Transfer: display loading spinner when loading wallet
[fix] Wallets: display alert when unable to remove secondary wallet + simplify code

[fix] Enforce use of angular-translate, when some keys are not defined (avoid error "translationId must be a not empty string")