In the current user addons system, only one addon could ever be installed at a time. This was because every addon would try to overwrite tdm_user_addons.script, and only the one in the alphabetically latest .pk4 would win. Merging addons was not a practical solution for most since this required a similar level of proficiency as actually creating the addons. Coming to the next dev build for 2.12, this limitation has been lifted by automatically including or calling all script files or functi