git-addons: new data load integration, new documentation
git-addons: new data load integration, new documentation

* Implements load-xxxx action as a helper for addon data
loading, with addon name to component name mapping (usually same, but
there may be exceptions, unfortunately)
* Revamped help documentation (-h)
* Added placeholder "config" task for later
* Various script improvements
ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp,ilscipio/scipio-erp