Reduce overhead connect dispatcher
- We tend to have 1000s (or 10000s) of connected dispatchers which
makes these prime targets to reduce overhead/memory
- Instead of creating new functions to wrap log exceptions each time
use partials which reuses the function body and only create new
arguments
Previous optimizations #103307#93602
* Fix memory leak in dispatcher removal
When we removed the last job/callable from the dict for the
signal we did not remove the dict for the signal which meant
it leaked
* comment
* cleanup a bit more
## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
Marc Mueller
J. Nick Koston
epenet
Erik Montnemery
Franck Nijhof
Paulus Schoutsen
Bas Nijholt
Ville Skyttä
Pascal Vizeli