This reverts commit 3bea5b25.

People continue to press the "don't press this" button. Maybe adding
some warnings indicating that this button will not fix their problems
will help...

The previous version of the logo had some wonky alignments and other
artifacts in some places on the dashed line. This commit provides a new
version of the logo with perfect alignments.

It also includes a single path for the dashed line, which can be used
to ease further modifications to the logo.

Correct uuid check according to RFC 4122

fixes #1611
fixes #1602

Now prints the correct JID to the log when finding devices without
sessions.