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Fixes #10850

It does not finish for unknown reasons

- Remove Plugin Installer
- Update OMEMO version

Seems some buggy server send IQ error with an unknown id. Log the error
but dont bother the user with it.

Fixes #10801

The current name conflicts with Flatpak

Weblate authored May 07, 2022 and Philipp Hörist committed May 07, 2022

Co-authored-by: Daniel Brötzmann <mailtrash@posteo.de>
Co-authored-by: El gran Pirujo <boina@disroot.org>
Co-authored-by: Tommy He <lovenemesis@gmail.com>
Co-authored-by: Weblate <noreply@weblate.org>
Co-authored-by: bodqhrohro <bodqhrohro@gmail.com>
Co-authored-by: pitchum <pitchum@gramaton.org>

- Integrate Plugin Installer
- Move to JSON manifests
- Add type annotations
- Rework Plugin Dialog

Fixes #10841