WhatsApp import

This is based on code contributed by Samuel Welten (https://github.com/jukefoxer/Signal-Android) and Wollwolke (https://github.com/Wollwolke/Signal-Android/tree/feature/wa-db-import). Thank you both for this.

It's currently still a pretty tedious process, but at least it's possible.

What works

Import 1-to-1 text conversation threads.
Import group chat conversations if a group chat with the same name is set up in the Signal App.
Importing images and videos messages from WhatsApp chats.

What doesn't work

Multimedia messages other than images and videos are currently not imported.
It's pretty slow (10 seconds per 1000 messages).

How to do it

Extract your unencrypted msgstore.db from your WhatsApp installation. There are several methods to do so. WhatsAppDump seems to offer a possibility that doesn't require rooting the device. A more detailed description of how to do so might be added here in the future.
Copy the msgstore.db file to the top level directory of your internal storage
Make an encrypted Backup of your Signal Messages using the built-in feature of the Signal App.
Build and install this version of the Signal App and import the encrypted Backup of your signal messages.
You might have to go to the app permission settings and give it the permission to manage all of the external storage.
Go to Backup => Import WhatsApp to start the import.
Be patient until it finishes.
If you're happy with the WhatsApp import create another encrypted backup of all Signal messages.
Install the original Signal app again and import the encrypted Backup.

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