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- Move stanza building and message logging code into message module
- Don't use event flow to create and send messages
- Remove resource lock
- Properly support sending a message to multiple recipients

It's available via properties attribute

- Move xhtml data into additional_data
- Remove xhtml event attribute
- Allows now to store both message and xhtml data in the database
- Always store xhtml data

It's available via properties attribute

It's available via properties attribute

It's available via properties attribute

It's available via properties attribute

It's available via properties attribute

It's available via properties attribute

It's available via properties attribute

Encryption information is saved in additional_data attribute

- Database: Save error in the corresponding message datarow
- ConversationTextview: Show error icon with error message as tooltip

- Remove 'decrypt' extension point, its not needed anymore
- Remove decryption finished methods
- Remove MessageReceived Events, DecryptedMessageReceived servs the same purpose now

Plugins decrypt messages before we execute this handler

Adapt to nbxmpp changes

Adapt to nbxmpp changes

Adapt to nbxmpp changes

Adapt to nbxmpp changes

Adapt to nbxmpp changes

- Store disco info in cache database
- Remove MucCapsCache, the DiscoInfo object supports all the methods

This looks at all messages incoming and saves the stanza-id if there is one.
Previously this was only done for messages of type=chat, which left out muc invites
and captcha messages, leading to fetching these messages later again.

nbxmpp makes sure that 'by' and 'id' are set if stanza_id is not None

Closes #9766

Move the code out of the MAM module as we need it also for
MUC history now

Before SyncThreshold was only used for MAM history. Now its also used
for MUC history.