L2SS-281: Move attribute extender bug fixes to a dedicated master branch

Closes L2SS-281

See merge request !61

L2SS-244: Return a scalar if given a scalar

(cherry picked from commit 68b98aa8)

L2SS-244: Dim (1,0) is by definition a scalar according to PyTango. Honour this.

(cherry picked from commit d487f383)

L2SS-244: Configure logging to actually see log lines in 'docker logs device-xyz'

(cherry picked from commit 2892211f)

L2SS-244: Default to scalar attributes in attribute_wrapper

(cherry picked from commit ecf4c781)

L2SS-279: Fix the broken image execution

Closes L2SS-279

See merge request !60

L2SS-263:  Fix for broken the image build

Closes L2SS-263

See merge request !57

L2SS-244: Cannot just link to the client in the class! needs to be looked up during device initialisation!

L2SS-244: Rewrite of StatisticsPacket class: unpack everything in 1 go for efficiency, and split off specialistic SST/XST/BST classes

L2SS-244: Return a max datetime in case of parse issues, not a min datetime which also indicates zeroes

L2SS-244: Don't go overly complex if we need a new buffer every time anyway. Just return a set of bytes for each packet.