* Fixes#5266.
* Adds the ability to supply the ItemCost level to easily override a specific level or only define some levels that have item requirements.
* When the Level label is provided for ItemCost it becomes dependent to that level only.
* Removes some remaining hardcoded skills that have skill level dependent checks.
* Added support to CSV2YAML to properly convert those level dependent skills.
* Adds documentation to header and upped version.
Thanks to @Pringle012 and @Lemongrass3110!