TriggerMenuMT: add custom log formatter

Add a custom logging formatter for all child loggers in the TriggerMenuMT package. Due to the deep module hierarchy, logger names often become too long and make log file reading difficult. The custom formatter now only shows the first and last module name, e.g.:

Py:TriggerMenuMT.HLTMenuConfig.UnconventionalTracking.FullScanLRTConfiguration

becomes

Py:TriggerMenuMT:FullScanLRTConfiguration

Also remove all custom logger names and use the module __name__ consistently.

ℹ The only real new code is in the __init__.py file. The rest is just text replace.