Use dict config for logging.

- Allow user to include a logging_config.py in the gajim user dir
- Support --logging-config to allow user to pass a custom logging config
- provide a default logging configuration: 'logging_config.py'
5 jobs from logging-improvements-20181031 in 5 minutes and 14 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #7969
run-appdata

00:00:06

passed #7967
run-mypy

00:00:25

passed #7968
run-pylint

00:04:14

passed #7966
run-test

00:00:15

 
  Build
passed #7970
run-build

00:00:13