Was trying to map out behavior of DsscGpuRunner as an FSM and found that this
was missing.

- Move shared memory buffer from kernel runner / buffer device to correction
device itself
  - Wrap the ring buffer around shmem for convenience
  - Reused shared memory segment, just change shape of ndarray view of it
- Rename kernel runner (was PyCudaPipeline) to DsscGpuRunner
- Move all gpu interaction, to DsscGpuRunner
  - Explicit load methods (should control more FSM-like)
- Pulse filter removed temporarily
  - Part of "splitter" section, gets in the way of next refactoring step
  - Will add again after switching to correct first, reshape second operation

commit ddc65f71
Author: David Hammer <dhammer@mailbox.org>
Date:   Wed Aug 25 16:58:47 2021 +0200

    Add individual source names to their metadata

commit 5ba47ce0
Author: David Hammer <dhammer@mailbox.org>
Date:   Wed Aug 25 16:48:12 2021 +0200

    Add metadata for control sources, too

Add manager device

See merge request karaboDevices/calng!2