This reverts commit 231d97ea81bb2249afa432b43d78ac963b80594a.

Migrating to AndroidX Fragments seems to have some unforseen side effects
and no clear benefits

on device contacts (contacts not synced) have an unstable system uri.
For quicksy.im contacts we can identify the contact based on the phone number
instead.

fixes #4174

fixes #4165

fixes #4167

the transcoder library we used hasn’t been updated in years

this commit switches to a maintained fork https://natario1.github.io/Transcoder/

This reverts commit 8d45cc5827f9fb3f6535749cc7d5c624fc08f5b5.

"uuid" is a primary key in "messages" but not in "messages_index",
the implication of that is very slow matching by UUID.

What can be done instead is matching messages_index.rowid to messages.rowid,
that is, an always-present clustered index.

This not only improves performance of full-text search but also of just
updating messages in any shape or form.

It now uses the data from the messages table instead of having a copy of each
message.

The message UUIDs are no longer part of the index.

If we don’t executePendingTransactions we might still access the overview fragment
while a replacement operation is in the works. This will lead to two
conversationfragments opening.

This reverts commit e528b9f5df59f7b49ae18c73396bd56525493e28.

I was originally convinced by the argumentation (quote always in same place)
but testing this out for a while really seems to break 'last correct' for me.

I use that way more frequently that quote