Extend spawn command (#1777)

* add missing EntityTypes

* small command refactorings and improvements
* move common command patterns and methods to CommandHelpers
* let the spawn command detect the entityType instead of spawning every entity as EntityVehicle
* add extra options for spawning gadgets for better debuging and testing

* More spawn command additions and cleanups+EntityVehicle changes
* Moved remaining patterns from GiveCommand and ClearCommand to CommandHelpers
* Added patterns for hp, maxhp, atk, def and (monster)ai for the spawn command
* Moved intParam parsing via regex to the CommandHelpers
* Read most of EntityVehicle stats from the ConfigGadget instead of hardcoding them

Co-authored-by: hartie95 <mail@hartie95.de>