WIP - Full Thread Support

[ajbura]

Blocked because: #257 (comment)

Description

Fixes #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

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[wrenix]

nice to see developing here:

• threads overview on room is nice
• show that a thread is started at a message is also a nice first step

but in current state it is not possible to see the messages in a thread ... (is there any developing for it or is it just still buggy)