Work changes

[laerreal]

A pack of changes made during recent work.

v4

• fixed qdev_realize_and_unref usage in machine boilerplate

v3

• rework changes in sysbusdevice.py and pcie.py
• remove junk comment in version.py

v2

• add new commits mainly related to device/machine boilerplate generation (on top of the branch)
• use is_trace_skipped
• fixup typos
• extend RSPWatcher docstring
• also adjust size of multiline (QLog) instruction

[laerreal]

v2 is ready

[laerreal]

v3 is ready

[laerreal]

v4 is ready