Problem/Motivation
The function module_load_include() used to be able to load files from modules that are either disabled and/or uninstalled. The functionality for that function has been moved to \Drupal::moduleHandler()->loadInclude().
Proposed resolution
Change \Drupal::moduleHandler()->loadInclude() so that it can also load files from disabled and/or uninstalled modules.
Remaining tasks
TBD
User interface changes
None
API changes
Minor addition.
Data model changes
None
Release notes snippet
TBD