plugin events: update following Events protoXEP submission:

update the plugin to follow the specification proposed at
https://github.com/xsf/xeps/pull/1206

Events are internally converted to a dict following a format described in
`event_data_2_event_elt` docstring.

RSVP mechanism now uses Pubsub Attachments (XEP-0470), with a user extensible data form.

Bridge methods signatures have changed.

rel 372
This commit is contained in:
Goffi 2022-09-21 22:41:49 +02:00
commit 7793a482a2

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