plugin android: attach an action dict to notification: instead of calling plyer's generic notify, AndroidNotification is now inherited to add a SàT specific behaviour: a "sat_action" dictionary is now attached, to indicate to the frontend what to do when the notification is opened.

# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
# TODO: remove this when changes are merged in Wokkel
from sat_tmp.wokkel import install
install()