This functionality is available in OGR and there is no longer
a need for a dedicated QGIS plugin to do this task
Marked as feature for documentation + changelog reminder
* this sorts and remove duplicates in #include in src and tests folders
* sorts includes in <...> before "..."
* keep #include "ui_..." on top of list
* can skip includes if an order should be kept
* can exlcude directories (hard-copies of external libraries)