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Add some methods to ChatControlBase to add status and info message to the ConversationTextview instead of going through
print_conversation() and print_conversation_line() which adds nothing to info and status messages

GUI code must not be aware of what integers map to connection states

- Remove some unused code

Fixes #9704

Status messages in group chats and private chats are now displayed
in the same way as status messages in single chat windows. This
avoids trailing brackets to be appended to a possible hyperlink inside
the status message. Fixes #8470

It was not reset if the previous MAM query was interrupted because of a disconnect

- Fix traceback when httpupload is not available
- Improve copy to clipboard text

Incomming messages of type 'normal' have to be acknowledged one by one,
which can be time consuming when many messages are received.

When blocking a contact which is not in the roster, the contact is
removed and the ChatControl is closed (if any).

Install precis-i18n before the other dependencies, because it is needed by
python-nbxmpp