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- wrong attribute used
- some mistakes in the slow tasks function

Increment version to 1.7.0

See merge request !107

also remove some duplicate description tags

tests: add basic reconnect/connect integration tests

See merge request !106

fix reconnect logic

See merge request !104

That value should be set statically. Worst case is we fail to resume the
session.

And trigger session_end only after we fail the resuming.

leave it to the connection_lost handler

* use asyncio wait_for to wait for a disconnected event
* abort the connection if the timeout is not enough

and keep track of slow tasks

it does not make sense to cancel it, it does not do anything when the
sending queue is empty, and clients should not fill the send queue when
not connected anyway.

and handle other loops properly

Remove the remaining block and threaded from examples

See merge request !105

XEP-0382: Spoiler Messages

See merge request !100

XEP-0444: Fix emoji detection

See merge request !103

the emoji lib just released a major release after 5 years, which breaks
the API. This new code is compatible with both.

Cancel  0199 pings on session end

See merge request !102

Clear futures when disabling the keepalive, and do it on every
disconnect instead of only at session end.

Handle connection errors in start_tls (fix #3449)

Closes #3449

See merge request !101

and keep track of them but be careful to not store too many

fix for #3442

XMLStream: Only fire "disconnected" after removal of related objects

See merge request !99

Otherwise we could end up reconnecting and getting some useful things
like the XML parser or other stuff removed afterwards.

Also, move 'session_end' before 'disconnected', it makes more sense that
way.

XEP-0045: Add a groupchat_join MUC event for components

See merge request !98