Revert "threema"

This reverts commit 621618e23c0941e69a8bf97cb69fbda9fc622dd6.
Revert "threema"

This reverts commit 6fb268763ace9d05682cb40ff4cb6a838e3c2a8e.
Revert "threema"

This reverts commit 6b4e19c8b387fb89fdbc7b0995e1c9c0d5c3986a.